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Hydrogen cyanide

Hydrogen cyanide (formerly known as prussic acid) is a chemical compound with the formula HCN and structural formula H\sC\tN. It is a highly toxic and flammable liquid that boils slightly above room temperature, at 25.6 °C. HCN is produced on an industrial scale and is a highly valued precursor to many chemical compounds ranging from polymers to pharmaceuticals. Large-scale applications are for the production of potassium cyanide and adiponitrile, used in mining and plastics, respectively. It is more toxic than solid cyanide compounds due to its volatile nature. A solution of hydrogen cyanide in water, represented as HCN, is called hydrocyanic acid. The salts of the cyanide anion are known as cyanides.

Whether hydrogen cyanide is an organic compound or not is a topic of debate among chemists, and opinions vary from author to author. Traditionally, it is considered inorganic by significant part of authors. Contrary to them, it is considered organic by other authors, because hydrogen cyanide belongs to the class of organic compounds known as nitriles which have the formula R\sC\tN, where R is typically organyl group (e.g., alkyl or aryl) or hydrogen. In the case of hydrogen cyanide, the R group is hydrogen H, so the other names of hydrogen cyanide are methanenitrile and formonitrile.

Structure and general properties
Hydrogen cyanide is a linear molecule, with a triple bond between carbon and nitrogen. The tautomer of HCN is HNC, hydrogen isocyanide.

HCN has a faint bitter almond-like odor that some people are unable to detect owing to a recessive genetic trait. The volatile compound has been used as inhalation rodenticide and human poison, as well as for killing whales. Cyanide ions interfere with iron-containing respiratory enzymes.

Chemical properties
Hydrogen cyanide is weakly acidic with a pKa of 9.2. It partially ionizes in water to give the cyanide anion, CN−. HCN forms hydrogen bonds with its conjugate base, species such as (CN-)(HCN)_{n}.

Hydrogen cyanide reacts with alkenes to give nitriles. The conversion, which is called hydrocyanation, employs nickel complexes as catalysts.
 * RCH\dCH2 + HCN → RCH2\sCH2CN

Four molecules of HCN will tetramerize into diaminomaleonitrile.

Metal cyanides are typically prepared by salt metathesis from alkali metal cyanide salts, but mercuric cyanide is formed from aqueous hydrogen cyanide:
 * HgO + 2 HCN  ->  Hg(CN)2  +  H2O

History of discovery
Hydrogen cyanide was first isolated in 1752 by French chemist Pierre Macquer who converted Prussian blue to an iron oxide plus a volatile component and that these could be used to reconstitute it. The new component was what is now known as hydrogen cyanide. It was subsequently prepared from Prussian blue by the Swedish chemist Carl Wilhelm Scheele in 1782, and was eventually given the German name Blausäure (lit. "Blue acid") because of its acidic nature in water and its derivation from Prussian blue. In English, it became known popularly as prussic acid.

In 1787, the French chemist Claude Louis Berthollet showed that prussic acid did not contain oxygen, an important contribution to acid theory, which had hitherto postulated that acids must contain oxygen (hence the name of oxygen itself, which is derived from Greek elements that mean "acid-former" and are likewise calqued into German as Sauerstoff). In 1811, Joseph Louis Gay-Lussac prepared pure, liquified hydrogen cyanide. In 1815, Gay-Lussac deduced Prussic acid's chemical formula. The radical cyanide in hydrogen cyanide was given its name from cyan, not only an English word for a shade of blue but the Greek word for blue (κύανος), again owing to its derivation from Prussian blue.

Production and synthesis
The most important process is the Andrussow oxidation invented by Leonid Andrussow at IG Farben in which methane and ammonia react in the presence of oxygen at about 1200 °C over a platinum catalyst:
 * 2 CH4 + 2 NH3 + 3 O2 → 2 HCN + 6 H2O

In 2006, between 500 million and 1 billion pounds (between 230,000 and 450,000 t) were produced in the US. Hydrogen cyanide is produced in large quantities by several processes and is a recovered waste product from the manufacture of acrylonitrile.

Of lesser importance is the Degussa process (BMA process) in which no oxygen is added and the energy must be transferred indirectly through the reactor wall:
 * CH4 + NH3 → HCN + 3H2

This reaction is akin to steam reforming, the reaction of methane and water to give carbon monoxide and hydrogen.

In the Shawinigan Process, hydrocarbons, e.g. propane, are reacted with ammonia.

In the laboratory, small amounts of HCN are produced by the addition of acids to cyanide salts of alkali metals:
 * H+ + NaCN → HCN + Na+

This reaction is sometimes the basis of accidental poisonings because the acid converts a nonvolatile cyanide salt into the gaseous HCN.

Hydrogen cyanide could be obtained from potassium ferricyanide and acid:

 * 6 H+ + [Fe(CN)6]3− → 6 HCN + Fe3+

Historical methods of production
The large demand for cyanides for mining operations in the 1890s was met by George Thomas Beilby, who patented a method to produce hydrogen cyanide by passing ammonia over glowing coal in 1892. This method was used until Hamilton Castner in 1894 developed a synthesis starting from coal, ammonia, and sodium yielding sodium cyanide, which reacts with acid to form gaseous HCN.

Applications
HCN is the precursor to sodium cyanide and potassium cyanide, which are used mainly in gold and silver mining and for the electroplating of those metals. Via the intermediacy of cyanohydrins, a variety of useful organic compounds are prepared from HCN including the monomer methyl methacrylate, from acetone, the amino acid methionine, via the Strecker synthesis, and the chelating agents EDTA and NTA. Via the hydrocyanation process, HCN is added to butadiene to give adiponitrile, a precursor to Nylon-6,6.

HCN is used globally as a fumigant against many species of pest insects that infest food production facilities. Both its efficacy and method of application lead to very small amounts of the fumigant being used compared to other toxic substances used for the same purpose. Using HCN as a fumigant also has less environmental impact, compared to some other fumigants such as sulfuryl fluoride, and methyl bromide.

Occurrence
HCN is obtainable from fruits that have a pit, such as cherries, apricots, apples, and nuts such as bitter almonds, from which almond oil and extract is made. Many of these pits contain small amounts of cyanohydrins such as mandelonitrile and amygdalin, which slowly release hydrogen cyanide. One hundred grams of crushed apple seeds can yield about 70 mg of HCN. The roots of cassava plants contain cyanogenic glycosides such as linamarin, which decompose into HCN in yields of up to 370 mg per kilogram of fresh root. Some millipedes, such as Harpaphe haydeniana, Desmoxytes purpurosea, and Apheloria release hydrogen cyanide as a defense mechanism, as do certain insects, such as burnet moths and the larvae of Paropsisterna eucalyptus. Hydrogen cyanide is contained in the exhaust of vehicles, and in smoke from burning nitrogen-containing plastics.

On Titan
HCN has been measured in Titan's atmosphere by four instruments on the Cassini space probe, one instrument on Voyager, and one instrument on Earth. One of these measurements was in situ, where the Cassini spacecraft dipped between 1000 and 1100 km above Titan's surface to collect atmospheric gas for mass spectrometry analysis. HCN initially forms in Titan's atmosphere through the reaction of photochemically produced methane and nitrogen radicals which proceed through the H2CN intermediate, e.g., (CH3 + N → H2CN + H → HCN + H2). Ultraviolet radiation breaks HCN up into CN + H; however, CN is efficiently recycled back into HCN via the reaction CN + CH4 → HCN + CH3.

On the young Earth
It has been postulated that carbon from a cascade of asteroids (known as the Late Heavy Bombardment), resulting from interaction of Jupiter and Saturn, blasted the surface of young Earth and reacted with nitrogen in Earth's atmosphere to form HCN.

In mammals
Some authors have shown that neurons can produce hydrogen cyanide upon activation of their opioid receptors by endogenous or exogenous opioids. They have also shown that neuronal production of HCN activates NMDA receptors and plays a role in signal transduction between neuronal cells (neurotransmission). Moreover, increased endogenous neuronal HCN production under opioids was seemingly needed for adequate opioid analgesia, as analgesic action of opioids was attenuated by HCN scavengers. They considered endogenous HCN to be a neuromodulator.

It has also been shown that, while stimulating muscarinic cholinergic receptors in cultured pheochromocytoma cells increases HCN production, in a living organism (in vivo) muscarinic cholinergic stimulation actually decreases HCN production.

Leukocytes generate HCN during phagocytosis, and can kill bacteria, fungi, and other pathogens by generating several different toxic chemicals, one of which is hydrogen cyanide.

The vasodilatation caused by sodium nitroprusside has been shown to be mediated not only by NO generation, but also by endogenous cyanide generation, which adds not only toxicity, but also some additional antihypertensive efficacy compared to nitroglycerine and other non-cyanogenic nitrates which do not cause blood cyanide levels to rise.

HCN is a constituent of tobacco smoke.

HCN and the origin of life
Hydrogen cyanide has been discussed as a precursor to amino acids and nucleic acids, and is proposed to have played a part in the origin of life. Although the relationship of these chemical reactions to the origin of life theory remains speculative, studies in this area have led to discoveries of new pathways to organic compounds derived from the condensation of HCN (e.g. Adenine).

In space
HCN has been detected in the interstellar medium and in the atmospheres of carbon stars. Since then, extensive studies have probed formation and destruction pathways of HCN in various environments and examined its use as a tracer for a variety of astronomical species and processes. HCN can be observed from ground-based telescopes through a number of atmospheric windows. The J=1→0, J=3→2, J= 4→3, and J=10→9 pure rotational transitions have all been observed.

HCN is formed in interstellar clouds through one of two major pathways: via a neutral-neutral reaction (CH2 + N → HCN + H) and via dissociative recombination (HCNH+ + e− → HCN + H). The dissociative recombination pathway is dominant by 30%; however, the HCNH+ must be in its linear form. Dissociative recombination with its structural isomer, H2NC+, exclusively produces hydrogen isocyanide (HNC).

HCN is destroyed in interstellar clouds through a number of mechanisms depending on the location in the cloud. In photon-dominated regions (PDRs), photodissociation dominates, producing CN (HCN + ν → CN + H). At further depths, photodissociation by cosmic rays dominate, producing CN (HCN + cr → CN + H). In the dark core, two competing mechanisms destroy it, forming HCN+ and HCNH+ (HCN + H+ → HCN+ + H; HCN + HCO+ → HCNH+ + CO). The reaction with HCO+ dominates by a factor of ~3.5. HCN has been used to analyze a variety of species and processes in the interstellar medium. It has been suggested as a tracer for dense molecular gas and as a tracer of stellar inflow in high-mass star-forming regions. Further, the HNC/HCN ratio has been shown to be an excellent method for distinguishing between PDRs and X-ray-dominated regions (XDRs).

On 11 August 2014, astronomers released studies, using the Atacama Large Millimeter/Submillimeter Array (ALMA) for the first time, that detailed the distribution of HCN, HNC, H2CO, and dust inside the comae of comets C/2012 F6 (Lemmon) and C/2012 S1 (ISON).

In February 2016, it was announced that traces of hydrogen cyanide were found in the atmosphere of the hot Super-Earth 55 Cancri e with NASA's Hubble Space Telescope.

On 14 December 2023, astronomers reported the first time discovery, in the plumes of Enceladus, moon of the planet Saturn, of hydrogen cyanide, a possible chemical essential for life as we know it, as well as other organic molecules, some of which are yet to be better identified and understood. According to the researchers, "these [newly discovered] compounds could potentially support extant microbial communities or drive complex organic synthesis leading to the origin of life."

As a poison and chemical weapon
In World War I, hydrogen cyanide was used by the French from 1916 as a chemical weapon against the Central Powers, and by the United States and Italy in 1918. It was not found to be effective enough due to weather conditions. The gas is lighter than air and rapidly disperses up into the atmosphere. Rapid dilution made its use in the field impractical. In contrast, denser agents such as phosgene or chlorine tended to remain at ground level and sank into the trenches of the Western Front's battlefields. Compared to such agents, hydrogen cyanide had to be present in higher concentrations in order to be fatal.

A hydrogen cyanide concentration of 100–200 ppm in breathing air will kill a human within 10 to 60 minutes. A hydrogen cyanide concentration of 2000 ppm (about 2380 mg/m3) will kill a human in about one minute. The toxic effect is caused by the action of the cyanide ion, which halts cellular respiration. It acts as a non-competitive inhibitor for an enzyme in mitochondria called cytochrome c oxidase. As such, hydrogen cyanide is commonly listed among chemical weapons as a blood agent.

The Chemical Weapons Convention lists it under Schedule 3 as a potential weapon which has large-scale industrial uses. Signatory countries must declare manufacturing plants that produce more than 30 metric tons per year, and allow inspection by the Organisation for the Prohibition of Chemical Weapons.

Perhaps its most infamous use is Zyklon B (German: Cyclone B, with the B standing for Blausäure – prussic acid; also, to distinguish it from an earlier product later known as Zyklon A), used in Nazi German extermination camps during World War II to kill Jews and other persecuted minorities en masse as part of their Final Solution genocide program. Hydrogen cyanide was also used in the camps for delousing clothing in attempts to eradicate diseases carried by lice and other parasites. One of the original Czech producers continued making Zyklon B under the trademark "Uragan D2" until around 2015.

During World War II, the US considered using it, along with cyanogen chloride, as part of Operation Downfall, the planned invasion of Japan, but President Harry Truman decided against it, instead using the atomic bombs developed by the secret Manhattan Project.

Hydrogen cyanide was also the agent employed in judicial execution in some U.S. states, where it was produced during the execution by the action of sulfuric acid on sodium or potassium cyanide.

Under the name prussic acid, HCN has been used as a killing agent in whaling harpoons, although it proved quite dangerous to the crew deploying it, and it was quickly abandoned. From the middle of the 18th century it was used in a number of poisoning murders and suicides.

Hydrogen cyanide gas in air is explosive at concentrations above 5.6%.

title: Hydrogen cyanide


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Potassium ferrocyanide

Potassium hexacyanidoferrate(II) is the inorganic compound with formula K4[Fe(CN)6]·3H2O. It is the potassium salt of the coordination complex [Fe(CN)6]4−. This salt forms lemon-yellow monoclinic crystals.

Synthesis
In 1752, the French chemist Pierre Joseph Macquer (1718–1784) first reported the preparation of Potassium hexacyanidoferrate(II), which he achieved by reacting Prussian blue (iron(III) ferrocyanide) with potassium hydroxide.

Modern production
Potassium hexacyanidoferrate(II) is produced industrially from hydrogen cyanide, iron(II) chloride, and calcium hydroxide, the combination of which affords Ca2[Fe(CN)6]·11H2O. This solution is then treated with potassium salts to precipitate the mixed calcium-potassium salt CaK2[Fe(CN)6], which in turn is treated with potassium carbonate to give the tetrapotassium salt.

Historical production
Historically, the compound was manufactured from nitrogenous organic material, iron filings, and potassium carbonate. Common nitrogen and carbon sources were torrified horn, leather scrap, offal, or dried blood. It was also obtained commercially from gasworks spent oxide (purification of city gas from hydrogen cyanide).

Chemical reactions
Treatment of potassium hexacyanidoferrate(II) with nitric acid gives H2[Fe(NO)(CN)5]. After neutralization of this intermediate with sodium carbonate, red crystals of sodium nitroprusside can be selectively crystallized.

Upon treatment with chlorine gas, potassium hexacyanidoferrate(II) converts to potassium hexacyanidoferrate(III):
 * 2 K4[Fe(CN)6] + Cl2 → 2 K3[Fe(CN)6] + 2 KCl

This reaction can be used to remove potassium hexacyanidoferrate(II) from a solution.

A famous reaction involves treatment with ferric salts to give Prussian blue. With the composition Fe$III 4$[Fe$II$(CN)$6$]$3$, this insoluble but deeply coloured material is the blue of blueprinting.

Applications
Potassium hexacyanidoferrate(II) finds many niche applications in industry. It and the related sodium salt are widely used as anticaking agents for both road salt and table salt. The potassium and sodium hexacyanidoferrates(II) are also used in the purification of tin and the separation of copper from molybdenum ores. Potassium hexacyanidoferrate(II) is used in the production of wine and citric acid.

In the EU, hexacyanidoferrates(II) (E 535–538) were, as of 2017, solely authorised in two food categories as salt additives.

It can also be used in animal feed.

In the laboratory, potassium hexacyanidoferrate(II) is used to determine the concentration of potassium permanganate, a compound often used in titrations based on redox reactions. Potassium hexacyanidoferrate(II) is used in a mixture with potassium ferricyanide and phosphate buffered solution to provide a buffer for beta-galactosidase, which is used to cleave X-Gal, giving a bright blue visualization where an antibody (or other molecule), conjugated to Beta-gal, has bonded to its target. On reacting with Fe(3) it gives a Prussian blue colour. Thus it is used as an identifying reagent for iron in labs.

Potassium hexacyanidoferrate(II) can be used as a fertilizer for plants.

Prior to 1900, before the invention of the Castner process, potassium hexacyanidoferrate(II) was the most important source of alkali metal cyanides. In this historical process, potassium cyanide was produced by decomposing potassium hexacyanidoferrate(II):

K4[Fe(CN)6] → 4 KCN + FeC2 + N2

Structure
Like other metal cyanides, solid potassium hexacyanidoferrate(II), both as the hydrate and anhydrous salts, has a complicated polymeric structure. The polymer consists of octahedral [Fe(CN)6]4− centers crosslinked with K+ ions that are bound to the CN ligands. The K+---NC linkages break when the solid is dissolved in water.

Toxicity
The toxicity in rats is low, with lethal dose (LD50) at 6400 mg/kg. The kidneys are the organ for ferrocyanide toxicity.

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Potassium ferrocyanide


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Atlantic cod

The Atlantic cod (: cod; Gadus morhua) is a fish of the family Gadidae, widely consumed by humans. It is also commercially known as cod or codling. Dry cod may be prepared as unsalted stockfish, and as cured salt cod or clipfish.

In the western Atlantic Ocean, cod has a distribution north of Cape Hatteras, North Carolina, and around both coasts of Greenland and the Labrador Sea; in the eastern Atlantic, it is found from the Bay of Biscay north to the Arctic Ocean, including the Baltic Sea, the North Sea, Sea of the Hebrides, areas around Iceland and the Barents Sea.

Atlantic cod can live for up to 25 years and typically grow up to 100–140 cm (39.4-55.1 in), but individuals in excess of 180 cm (70.9 in) and 50 kg (110.2 lbs) have been caught. They will attain sexual maturity between ages two and eight with this varying between populations and has varied over time.

Colouring is brown or green, with spots on the dorsal side, shading to silver ventrally. A stripe along its lateral line (used to detect vibrations) is clearly visible. Its habitat ranges from the coastal shoreline down to 300 m along the continental shelf.

Atlantic cod is one of the most heavily fished species. Atlantic cod was fished for a thousand years by north European fishers who followed it across the North Atlantic Ocean to North America. It supported the US and Canada fishing economy until 1992, when the Canadian Government implemented a ban on fishing cod. Several cod stocks collapsed in the 1990s (decline of more than 95% of maximum historical biomass) and have failed to fully recover even with the cessation of fishing. This absence of the apex predator has led to a trophic cascade in many areas. Many other cod stocks remain at risk. The Atlantic cod is labelled vulnerable on the IUCN Red List of Threatened Species, per a 1996 assessment that the IUCN notes needs updating. A 2013 assessment covering only Europe shows the Atlantic cod has rebounded in Europe, and it has been relabelled least concern.

Taxonomy
The Atlantic cod is one of three cod species in the genus Gadus along with Pacific cod and Greenland cod. A variety of fish species are colloquially known as cod, but they are not all classified within the Gadus, though some are in the Atlantic cod family, Gadidae.

Shoaling

Atlantic cod are a shoaling species and move in large, size-structured aggregations. Larger fish act as scouts and lead the shoal's direction, particularly during post spawning migrations inshore for feeding. Cod actively feed during migration and changes in shoal structure occur when food is encountered. Shoals are generally thought to be relatively leaderless, with all fish having equal status and an equal distribution of resources and benefits. However, some studies suggest that leading fish gain certain feeding benefits. One study of a migrating Atlantic cod shoal showed significant variability in feeding habits based on size and position in the shoal. Larger scouts consumed a more variable, higher quantity of food, while trailing fish had less variable diets and consumed less food. Fish distribution throughout the shoal seems to be dictated by fish size, and ultimately, the smaller lagging fish likely benefit from shoaling because they are more successful in feeding in the shoal than they would be if migrating individually, due to social facilitation.

Predation
Atlantic cod are apex predators in the Baltic and adults are generally free from the concerns of predation. Juvenile cod, however, may serve as prey for adult cod, which sometimes practice cannibalism. Juvenile cod make substrate decisions based on risk of predation. Substrates refer to different feeding and swimming environments. Without apparent risk of predation, juvenile cod demonstrated a preference for finer-grained substrates such as sand and gravel-pebble. However, in the presence of a predator, they preferred to seek safety in the space available between stones of a cobble substrate. Selection of cobble significantly reduces the risk of predation. Without access to cobble, the juvenile cod simply tries to escape a predator by fleeing.

Additionally, juvenile Atlantic cod vary their behaviour according to the foraging behaviour of predators. In the vicinity of a passive predator, cod behaviour changes very little. The juveniles prefer finer-grained substrates and otherwise avoid the safer kelp, steering clear of the predator. In contrast, in the presence of an actively foraging predator, juveniles are highly avoidant and hide in cobble or in kelp if cobble is unavailable.

Heavy fishing of cod in the 1990s and the collapse of American and Canadian cod stocks resulted in trophic cascades. As cod are apex predators, overfishing them removed a significant predatory pressure on other Atlantic fish and crustacean species. Population-limiting effects on several species including American lobsters, crabs, and shrimp from cod predation have decreased significantly, and the abundance of these species and their increasing range serve as evidence of the Atlantic cod's role as a major predator rather than prey.

Swimming
Atlantic cod have been recorded to swim at speeds of a minimum of 2 - 5 cm/s and a maximum of 21 - 54 cm/s with a mean swimming speed of 9 - 17 cm/s. In one hour, cod have been recorded to cover a mean range of 99 to 226 m. Swimming speed was higher during the day than at night. This is reflected in the fact that cod more actively search for food during the day. Cod likely modify their activity pattern according to the length of daylight, thus activity varies with time of year.

Response to changing temperatures
Swimming and physiological behaviours change in response to fluctuations in water temperature. Respirometry experiments show that heart rates of Atlantic cod change drastically with changes in temperature of only a few degrees. A rise in water temperature causes marked increases in cod swimming activity. Cod typically avoid new temperature conditions, and the temperatures can dictate where they are distributed in water. They prefer to be deeper, in colder water layers during the day, and in shallower, warmer water layers at night. These fine-tuned behavioural changes to water temperature are driven by an effort to maintain homeostasis to preserve energy. This is demonstrated by the fact that a decrease of only 2.5 C-change caused a highly costly increase in metabolic rate of 15 to 30%.

Feeding and diet
The diet of the Atlantic cod consists of fish such as herring, capelin (in the Eastern Atlantic Ocean), and sand eels, as well as mollusks, tunicates, comb jellies, crustaceans, echinoderms and sea worms. Stomach sampling studies have discovered that small Atlantic cod feed primarily on crustaceans, while large Atlantic cod feed primarily on fish. In certain regions, the main food source is decapods with fish as a complementary food item in the diet. Wild Atlantic cod throughout the North Sea depend, to a large extent, on commercial fish species also used in fisheries, such as Atlantic mackerel, haddock, whiting, Atlantic herring, European plaice, and common sole, making fishery manipulation of cod significantly easier. Ultimately, food selection by cod is affected by the food item size relative to their own size. However, providing for size, cod do exhibit food preference and are not simply driven by availability.

Atlantic cod practice some cannibalism. In the southern North Sea, 1–2% (by weight) of stomach contents for cod larger than 10 cm consisted of juvenile cod. In the northern North Sea, cannibalism was higher, at 10%. Other reports of cannibalism have estimated as high as 56% of the diet consists of juvenile cod.

When hatched, cod larvae are altricial, entirely dependent on a yolk sac for sustenance until mouth opening at ~24 degree days. The stomach generally develops at around 240 degree days. Before this point the intestine is the main point of food digestion using pancreatic enzymes such as trypsin.

Reproduction

Atlantic cod will attain sexual maturity between ages two and eight with this varying between different populations and has also varied over time with a population. Their gonads take several months to develop and most populations will spawn from January to May. For many populations, the spawning grounds are located in a different area than the feeding grounds so require the fish to migrate in order to spawn. On the spawning area, males and females will form large schools. Based on behavioral observations of cod, the cod mating system has been likened to a lekking system, which is characterized by males aggregating and establishing dominance hierarchies, at which point females may visit and choose a spawning partner based on status and sexual characteristics. Evidence suggests male sound production and other sexually selected characteristics allow female cod to actively choose a spawning partner. Males also exhibit aggressive interactions for access to females.

Atlantic cod are batch spawners, in which females will spawn approximately 5-20 batches of eggs over a period of time with 2–4 days between the release of each batch. Each female will spawn between 2 hundred thousand and 15 million eggs, with larger females spawning more eggs. Females release gametes in a ventral mount, and males then fertilize the released eggs. The eggs and newly hatched larvae float freely in the water and will drift with the current, with some populations relying upon the current to transport the larvae to nursery areas.

Parasites
Atlantic cod act as intermediate, paratenic, or definitive hosts to a large number of parasite species: 107 taxa listed by Hemmingsen and MacKenzie (2001) and seven new records by Perdiguero-Alonso et al. (2008). The predominant groups of cod parasites in the northeast Atlantic were trematodes (19 species) and nematodes (13 species), including larval anisakids, which comprised 58.2% of the total number of individuals. Parasites of Atlantic cod include copepods, digeneans, monogeneans, acanthocephalans, cestodes, nematodes, myxozoans, and protozoans.

Fisheries
Atlantic cod has been targeted by humans for food for thousands of years, and with the advent of modern fishing technology in the 1950s there was a rapid rise in landings. Cod is caught using a variety of fishing gears including bottom trawls, demersal longlines, Danish seine, jigging and hand lines. The quantity of cod landed from fisheries has been recorded by many countries from around the 1950s and attempts have been made to reconstruct historical catches going back hundreds of years. ICES and NAFO collects landings data, alongside other data, which is used to assess the status of the population against management objectives. The landings in the eastern Atlantic frequently exceeds 1 million tonnes annually from across 16 populations/management units with landings from the Northeast Atlantic cod population and Iceland accounting for the majority of the landings, Since 1992, when the cod moratorium took effect in Canada, landings in the western Atlantic have been considerably lower than in the eastern Atlantic, generally being less than 50,000 tonnes annually.

Northwest Atlantic cod
The Northwest Atlantic cod has been regarded as heavily overfished throughout its range, resulting in a crash in the fishery in the United States and Canada during the early 1990s.

Newfoundland's northern cod fishery can be traced back to the 16th century. On average, about 300000 t of cod were landed annually until the 1960s, when advances in technology enabled factory trawlers to take larger catches. By 1968, landings for the fish peaked at 800000 t before a gradual decline set in. With the reopening of the limited cod fisheries in 2006, nearly 2700 t of cod were hauled in. In 2007, offshore cod stocks were estimated at 1% of what they were in 1977.

Technologies that contributed to the collapse of Atlantic cod include engine-powered vessels and frozen food compartments aboard ships. Engine-powered vessels had larger nets, greater range, and better navigation. The capacity to catch fish became limitless. In addition, sonar technology gave an edge to detecting and catching fish. Sonar was originally developed during World War II to locate enemy submarines, but was later applied to locating schools of fish. These new technologies, as well as bottom trawlers that destroyed entire ecosystems, contributed to the collapse of Atlantic cod. They were vastly different from old techniques used, such as hand lines and long lines.

The fishery has only recently begun to recover, and may never fully recover because of a possibly stable change in the food chain. Atlantic cod was a top-tier predator, along with haddock, flounder and hake, feeding upon smaller prey, such as herring, capelin, shrimp, and snow crab. With the large predatory fish removed, their prey have had population explosions and have become the top predators, affecting the survival rates of cod eggs and fry.

In the winter of 2011–2012, the cod fishery succeeded in convincing NOAA to postpone for one year the planned 82% reduction in catch limits. Instead, the limit was reduced by 22%. The fishery brought in $15.8 million in 2010, coming second behind Georges Bank haddock among the region's 20 regulated bottom-dwelling groundfish. Data released in 2011 indicated that even closing the fishery would not allow populations to rebound by 2014 to levels required under federal law. Restrictions on cod effectively limit fishing on other groundfish species with which the cod swim, such as flounder and haddock.

Northeast Atlantic cod

The Northeast Atlantic has the world's largest population of cod. By far, the largest part of this population is the Northeast Arctic cod, as it is labelled by the ICES, or the Arcto-Norwegian cod stock, also referred to as skrei, a Norwegian name meaning something like "the wanderer", distinguishing it from coastal cod. The Northeast Arctic cod is found in the Barents Sea area. This stock spawns in March and April along the Norwegian coast, about 40% around the Lofoten archipelago. Newly hatched larvae drift northwards with the coastal current while feeding on larval copepods. By summer, the young cod reach the Barents Sea, where they stay for the rest of their lives, until their spawning migration. As the cod grow, they feed on krill and other small crustaceans and fish. Adult cod primarily feed on fish such as capelin and herring. The northeast Arctic cod also show cannibalistic behaviour. Estimated stock size was 2260000 t in 2008.

The North Sea cod stock is primarily fished by European Union member states, the United Kingdom and Norway. In 1999, the catch was divided among Denmark (31%), Scotland (25%), the rest of the United Kingdom (12%), the Netherlands (10%), Belgium, Germany and Norway (17%). In the 1970s, the annual catch rose to between 200000 and 300000 t. Due to concerns about overfishing, catch quotas were repeatedly reduced in the 1980s and 1990s. In 2003, ICES stated a high risk existed of stock collapse if then current exploitation levels continued, and recommended a moratorium on catching Atlantic cod in the North Sea during 2004. However, agriculture and fisheries ministers from the Council of the European Union endorsed the EU/Norway Agreement and set the total allowable catch at 27300 t. Seafood sustainability guides, such as the Monterey Bay Aquarium's Seafood Watch, often recommend environmentally conscious customers not purchase Atlantic cod.

The stock of Northeast Arctic cod was more than four million tons following World War II, but declined to a historic minimum of 740000 t in 1983. The catch reached a historic maximum of 1343000 t in 1956, and bottomed out at 212000 t in 1990. Since 2000, the spawning stock has increased quite quickly, helped by low fishing pressure. The total catch in 2012 was 754131 t, the major fishers being Norway and Russia.

Baltic cod
Decades of overfishing in combination with environmental problems, namely little water exchange, low salinity and oxygen-depletion at the sea bottom, caused major threats to the Baltic cod stocks.

There are at least two populations of cod in the Baltic Sea: One large population that spawns east of Bornholm and one population spawning west of Bornholm. Eastern Baltic cod is genetically distinct and adapted to the brackish environment. Adaptations include differences in hemoglobin type, osmoregulatory capacity, egg buoyancy, sperm swimming characteristics and spawning season. The adaptive responses to the environmental conditions in the Baltic Sea may contribute to an effective reproductive barrier, and thus, eastern Baltic cod can be viewed as an example of ongoing speciation. Due to drastically low cod population sizes, commercial fishing of eastern Baltic cod is prohibited since 2019. However, unfavourable environmental conditions in the eastern Baltic Sea, i.e., low salinity and increasing oxygen-depletion at the sea bottom, led to presently only the Bornholm Basin (Southern Baltic Sea) having sufficient conditions for successful reproduction of eastern Baltic cod.

The western Baltic cod consists of one or several small subpopulations that are genetically more similar to the North Sea cod. In the Arkona basin (located off Cape Arkona, Rügen), spawning and migrating cod from both the eastern and western stocks intermingle in proportions that vary seasonally. The immigration of eastern cod into the western Baltic management unit may mask a poor state of the populations in the western management unit.

title: Atlantic cod


text:
Wheel of time

The wheel of time or wheel of history (also known as Kalachakra) is a concept found in several religious traditions and philosophies, notably religions of Indian origin such as Hinduism, Jainism, Sikhism, and Buddhism, which regard time as cyclical and consisting of repeating ages. Many other cultures contain belief in a similar concept: notably, the Q'ero people of Peru, the Hopi people of Arizona, and the Bakongo people of Angola and Democratic Republic of the Congo.

Ancient Africa
In traditional Bakongo religion, the four elements are incorporated into the Kongo cosmogram. This sacred wheel depicts the physical world (Nseke), the spiritual world of the ancestors (Mpémba), the Kalûnga line that runs between the two worlds, the sacred river (mbûngi) that began as a circular void and forms a circle around the two worlds, and the path of the sun. Each element correlates to a period in the life cycle, which the Bakongo people also equate to the four cardinal directions and seasons. According to their cosmology, all living things go through this cycle.

 * Mbûngi represents aether and is the void that exists before creation.
 * Musoni time (South) represents air and is the period of conception that takes place during spring.
 * Kala time (East) represent fire and is the period of birth that takes place during summer.
 * Tukula time (North) represents earth and is the period of maturity that takes place during fall.
 * Luvemba time (West) represents water and is the period of death that takes place during winter.

Ancient Rome
The philosopher and emperor Marcus Aurelius saw time as extending forwards to infinity and backwards to infinity, while admitting the possibility (without arguing the case) that "the administration of the universe is organized into a succession of finite periods".

Buddhism
The Wheel of Time or Kalachakra is a Tantric deity that is associated with Tibetan Tantric Buddhism, which encompasses all four main schools of Sakya, Nyingma, Kagyu and Gelug, and is especially important within the lesser-known Jonang tradition.

The Kalachakra tantra prophesies a world within which (religious) conflict is prevalent. A worldwide war will be waged which will see the expansion of the mystical Kingdom of Shambhala led by a messianic king.

Hinduism
In Hindu cosmology, kala (time) is eternal, repeating general events in four types of cycles. The smallest cycle is a maha-yuga (great age), containing four yugas (dharmic ages): Satya Yuga, Treta Yuga, Dvapara Yuga and Kali Yuga. A manvantara (age of Manu) contains 71 maha-yugas. A kalpa (day of Brahma) contains 14 manvantaras and 15 sandhyas (connecting periods), which lasts for 1,000 maha-yugas and is followed by a pralaya (night of partial dissolution) of equal length, where a day and night make one full day. A maha-kalpa (life of Brahma) lasts for 100 of Brahma's years of 12 months of 30 full days (100 360-day years) or 72,000,000 maha-yugas, which is followed by a maha-pralaya (full dissolution) of equal length.

Jainism
Within Jainism, time is thought to be a wheel that rotates for infinity without a beginning. This wheel of time holds twelve spokes that each symbolize a different phase in the universe's cosmological history. It is further divided into two equal halves having six eras in them. While in a downward motion, the wheel of time falls into what is known as Avasarpiṇī and when in an upward motion, enters a state called Utsarpini. During both motions of the wheel, 24 tirthankaras come forth to teach the three jewels or sacred Jain teachings of right faith, right knowledge, and right practice, then create a spiritual ford across the ocean of rebirth for humanity.

Literature
In an interview included with the audiobook editions of his novels, author Robert Jordan has stated that his bestselling fantasy series The Wheel of Time borrows the titular concept from Hindu mythology.

The first chapter of every book in the series begins with the lines: "The Wheel of Time turns, and ages come and pass, leaving memories that become legend. Legends fade to myth, and even myth is long forgotten when the Age that gave it birth comes again."

Television

 * Several episodes of the American TV series Lost feature a wheel that can be physically turned in order to manipulate space and time. In a series of episodes during the fifth season, the island on which the show takes place begins to skip violently back and forth through time after the wheel is pulled off its axis.

 * The character Rust Cohle in the first season of True Detective makes numerous references to his belief that events in time repeat, claiming that "Time is a flat circle".

title: Wheel of time


text:
Talk:Queen (chess)

He was truly called Vazir
''In the historical ancestors of chess, shatranj, the queen was a fairly weak piece called a fers or vizier. The modern queen's move arose in 15th century Europe.''

I have never heard the sentence above. I urge author to introduce a source for his or her claim.

Well, it is truly called Vazir or Farzin in Persian and the Persia since firstly in ancient Persia and ancient age in general the queen had no political power and status. In ancient Persia, for example, there was a person who was very close to the King and was consulting with the King. Some thing like chancellor or Prime minister. secondly, as you know, when a pawn cross the board and gets over the edge, he becomes queen, well it does not make sense. The idea behind this incident is that the new status is a prize for a brave soldier that passes the enemy's area. Certainly he is not gonna marry the King and become second queen!, it was not practiced in the old Persia. He becomes a minister and a man who has more power. As a result, as I said, they were calling it Minister and in that era, minister or Vazir or Chancellor was the most important person in the country, as you see the current UK political system, the prime minister is having the real power not the queen or King or any other member of royal family. The King in the old Persia was head of state. The practical affairs and ministries were managed by the chancellor.

in addition to what I said above
especially a person who really helped the chess get developed was named "Bozorg Mehr" or Burzoe. In his era, as I said he had a status like chancellor and he was not the King. proved by very well-known sourses and diries, he was playing chess daily with the King (Khosrau I)

pawn turns into queen
I think I read somewhere that in case a pawn makes it all the way to the opposite edge of the board it may be exchanged for a queen. If this is true it should be included in the article.
 * Note that it doesn't necessarily have to be a queen, it can promote to any piece of its own colour except a king.  Insane  phantom   (please comment on my Editor Review!)  12:47, 6 January 2007 (UTC)

Removed
I removed the unnecessary " Queen. " from the diagram caption; it isn't really required. Yuser31415 (Editor review two!) 07:02, 24 January 2007 (UTC)

Initial placement
The diagram showing initial placement of the queens is wrong; they're shown on the king's file. Akwdb (talk) 18:11, 24 August 2011 (UTC)

 * Bubba73 You talkin' to me? 18:17, 24 August 2011 (UTC)

Example of sacrificing queen
I think it would be appropriate to add the example of Bobby Fischer's brilliant queen sacrifice on the way to winning The Game of the Century. The two places I was considering putting it were the end of the 1st paragraph under Piece value, or under Queen sacrifice. Do others agree? Where would you put it? DoctorEric (talk) 17:57, 21 March 2012 (UTC)

 * Certainly appropriate, I would say, and the Queen sacrifice section seems the best spot. - DavidWBrooks (talk) 18:21, 21 March 2012 (UTC)

 * I suggest take a look at pt:Dama_(xadrez) which mentions others very famous sacrifices. Opera game, Evergreen game and Immortal Game also sacrifice the Queen. OTAVIO1981 (talk) 11:35, 22 March 2012 (UTC)

In Estonian (country of Keres, Ehlvest etc) queen is called lipp (flag) — Preceding unsigned comment added by 78.28.84.98 (talk) 12:26, 20 May 2012 (UTC)

Moving like a knight?
"In Russia for a long time the queen could also move like a knight; some players disappproved of this ability to "gallop like the horse (= knight)". - sources given:

 * (in Russian)
 * (in Russian)

The claim was added by User:Anthony_Appleyard, the sources (?) by User:D.M. from Ukraine. But these are, as far as I can see, only dictionaries (and not too serious ones), not supporting the statement. I ask for clarification and better sources. --KnightMove (talk) 16:35, 17 May 2013 (UTC)
 * These sources are on-line versions of a well-known Vladimir Dal's Russian dictionary. It is really understandable from that article of the dictionary that once the queen could move like a knight if the players approved this. But I agree that some better sources would be desirable. --D.M. from Ukraine (talk) 20:17, 17 May 2013 (UTC)

 * I found another ref. Anthony Appleyard (talk) 22:11, 17 May 2013 (UTC)

 * I confirmed the reference in A History of Chess, by Murray. Bubba73 You talkin' to me? 23:52, 17 May 2013 (UTC)
 * Thank you all - I'm sorry for being too sceptic and harsh in the edit summary. --KnightMove (talk) 12:42, 20 May 2013 (UTC)

most powerful piece?
The first line says that it's the most powerful piece. However, isn't that subjective? I think the King is the most powerful piece if you base it on winning/losing the game. If your King is checkmated, you lose. You cannot be without a King. I think "most powerful" should be removed, as it's misleading. Even though most people associate the Queen with 9 points (the most second to the King -- which is infinity), this is still a matter of opinion, as some people give it 10 or some may even put it less than a rook. Also, if the Queen is in a terrible position, then it's worth less points.

Maybe it should be reworded to say, "Most players attribute it the most points, second to the King, and therefore, deem it more important than the pawn, bishop, knight, and rook at least in the opening/middle. In the endgame, the pawns may be closer to the edges which can change into Queens, so they may be equal to Queens...."

Or something like that. — Preceding unsigned comment added by 74.240.86.80 (talk) 07:02, 21 January 2015 (UTC)
 * The King is the most valuable, not the most powerful. Thats what the scoring is about. The text is fine. A pawn on the seventh is still just a pawn and the threat it poses is potential rather than real. Jkmaskell (talk) 09:29, 21 January 2015 (UTC)

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Yalom
The claim attributed to Yalom that "Eleanor of Aquitaine and Blanche of Castile and Isabella I of Castile, the cult of the Virgin Mary,and the power ascribed to women in the troubadour tradition of courtly love," contributed to the promotion of the queen's power in chess was already made by Henry Adams in his famous book The Mont Ste-Michel and Chartres. It also contradicts the later thesis attributed to Yalom that in fact this shift came about under Isabel la Catolica - hundreds of years later - and spread through Europe because of the printing press and the expulsion of the Sephardic Jews (2604:2000:C5CA:AF00:7D57:B7F3:A393:1704 (talk) 14:47, 25 October 2016 (UTC)).
 * I'd be in favour of trimming or eliminating the Yalom material. It is pure speculation and not supported by any other historian or academic that I know of. MaxBrowne2 (talk) 06:56, 7 November 2018 (UTC)

There seems to be more than one wrong fact from the Yalom reference. It states "Starting from Spain, this new version – called "queen's chess" (scacchi de la donna), or pejoratively "madwoman's chess" (scacchi alla rabiosa) [...]" but if it really came from Spain, there might be an error with the given names in parentheses, as they are in italian. Rorlork (talk) 15:50, 21 July 2019 (UTC)

I say we just eliminate Yalom from the article. It's about a chess piece, not some cult of the Virgin Mary feminist patriarchal theory or whatever. MaxBrowne2 (talk) 14:51, 11 July 2023 (UTC)

Power of chess figures
It would we very desirable if we put in the article the famous table of powers for figures of chess because I think chess figures have some nice properties even outside the game of chess itself. Momentaly I have no time to do that but I'll try some day. I must say I don't like the games itself and I don't play it well, but I prefer very much problems related to the game (for example the famous 8 queen problem and similar ones). If you mean the relative strengths of the pieces (queen = 9 points, rook = 5 points etc.), this is already covered in Chess/Strategy and Tactics. — Preceding unsigned comment added by 2A00:F41:287B:C691:0:60:CB5F:B301 (talk) 18:25, 22 January 2021 (UTC)

title: Talk:Queen (chess)


text:
Clark Gable

William Clark Gable (February 1, 1901 –November 16, 1960) was an American film actor. Often referred to as the "King of Hollywood", he had roles in more than 60 films in a variety of genres during a career that lasted 37 years, three decades of which was as a leading man. He was named the seventh greatest male movie star of classic American cinema by the American Film Institute.

Gable won the Academy Award for Best Actor for his role in the romantic comedy, It Happened One Night (1934). He was further Oscar-nominated for his roles as Fletcher Christian in the drama Mutiny on the Bounty (1935), and Rhett Butler in the historical romance drama Gone with the Wind (1939). He received Golden Globe Award nominations for his comedic roles in Teacher's Pet (1958), and But Not for Me (1959). He also starred in Call of the Wild (1935), Key to the City (1950), and Mogambo (1953). His final on-screen role was as an aging cowboy in The Misfits (1961).

Gable was one of the most consistent box-office performers in the history of Hollywood, appearing on Quigley Publishing's annual Top Ten Money Making Stars Poll sixteen times. He appeared opposite many of the most popular actresses of their time. He frequently acted alongside Joan Crawford, Myrna Loy, Jean Harlow, Lana Turner, Norma Shearer and Ava Gardner. Gable died of a heart attack in 1960 at the age of 59.

1901–1919: Family and upbringing
William Clark Gable was born on February 1, 1901, in Cadiz, Ohio, to William Henry "Will" Gable (1870–1948), an oil-well driller, and his wife Adeline ( Hershelman). His father was a Protestant and his mother a Catholic. Gable was named Bill after his father, but he was almost always called Clark, and referred to as "the kid" by his father. Gable was six months old when he was baptized at a Roman Catholic church in Dennison, Ohio. When he was ten months old, his mother died. His father refused to raise him in the Catholic faith, which provoked criticism from the Hershelman family. Gable and his father were active in the Methodist church where his father was a Sunday School teacher. The dispute was resolved when his father agreed to allow him to spend time with his maternal uncle Charles Hershelman and his wife on their farm in Vernon Township, Pennsylvania. In April 1903, Gable's father married Jennie Dunlap (1874–1920).

Gable's stepmother raised the tall, shy child with a loud voice to be well-dressed and well-groomed. She played the piano and gave him lessons at home. He later took up brass instruments, becoming the only boy in the Hopedale Men's town band at age 13. Gable was mechanically inclined and loved to repair cars with his father, who insisted that he engage in masculine activities such as hunting and hard physical work. Gable also loved literature; he would recite Shakespeare among trusted company, particularly the sonnets.

His father had financial difficulties in 1917 and decided to try his hand at farming, and moved the family to Palmyra Township, near Akron, Ohio. His father insisted that he work the farm, but Gable soon left to work in Akron for the Firestone Tire and Rubber Company.

1920–1923: Early career
Gable was inspired to become an actor after seeing the play The Bird of Paradise at age 17, but he was unable to make a start in acting until he turned 21 and received his $300 inheritance from a Hershelman trust. After his stepmother died in 1920, his father moved to Tulsa, Oklahoma, going back into the oil business. He worked with his father for some time wildcatting and sludge removing in the oil fields of Oklahoma before traveling to the Pacific Northwest.

Gable toured in second-class stock companies, finding work with traveling tent shows, lumber mills, and other odd jobs. He made his way across the Midwest to Portland, Oregon, where he worked as a necktie salesman in the Meier & Frank department store. Also working there was local stage actor Earle Larimore, (the nephew of Laura Hope Crews who portrayed Aunt Pittypat alongside Gable in Gone with the Wind) who encouraged Gable to return to acting. Though Larimore didn't invite him to join his theater group The Red Lantern Players, he did introduce Gable to one of its members, Franz Dorfler, and they started dating. After the couple's audition for The Astoria Players, Gable's lack of training was evident, but the theater group accepted him after cajoling from Larimore. Gable and Dorfler moved to Astoria, Oregon, touring with the group until its bankruptcy, and then moved back to Portland where Gable obtained a day job with Pacific Telephone and started receiving dramatic lessons in the evening.

Gable's acting coach, Josephine Dillon, was a theater manager in Portland. She paid to have his teeth fixed and his hair styled. She guided him in building up his chronically undernourished body, and taught him better body control and posture. He slowly managed to lower his naturally high-pitched voice, his speech habits improved, and his facial expressions became more natural and convincing. After a long period of her training, Dillon considered Gable ready to attempt a film career.

1924–1930: Stage and silent films
Gable and Dillon traveled to Hollywood in 1924. Dillon became his manager and also his wife; she was 17 years his senior. He changed his stage name from W. C. Gable to Clark Gable and appeared as an extra in such silent films as Erich von Stroheim's The Merry Widow (1925), The Plastic Age (1925) starring Clara Bow, and Forbidden Paradise (1924) starring Pola Negri. He appeared in a series of two-reel comedies called The Pacemakers and in Fox's The Johnstown Flood (1926). He also appeared as a bit player in a series of shorts. However, he was not offered any major film roles, so he returned to the stage in What Price Glory? (1925).

He became lifelong friends with Lionel Barrymore, who initially scolded Gable for what he deemed amateurish acting but nevertheless urged him to pursue a stage career. During the 1927–28 theater season, he acted with the Laskin Brothers Stock Company in Houston, Texas; while there, he played many roles, gained considerable experience, and became a local matinee idol. He then moved to New York City, where Dillon sought work for him on Broadway. He received good reviews in Machinal (1928), with one critic describing him as "young, vigorous, and brutally masculine".

Gable and Dillon separated, filing for divorce in March 1929, while he began working on the play Hawk Island in New York which ran for 24 performances. In April 1930, Gable's divorce became final, and a few days later he married Texas socialite Maria Franklin Prentiss Lucas Langham, nicknamed "Ria". After moving to California, they were married again in 1931, possibly due to differences in state legal requirements.

1930–1935: Early success
In 1930, after his impressive appearance as the seething and desperate character Killer Mears in the Los Angeles stage production of The Last Mile, Gable was offered a contract with Pathe Pictures. His only film for them and first role in a sound picture was as the unshaven villain in their low-budget William Boyd Western, The Painted Desert (1931). The studio experienced financial problems after the film's delayed release, so Gable left for work at Warner Bros.

The same year in Night Nurse, Gable played a villainous chauffeur who knocked Barbara Stanwyck's character unconscious for trying to save two children whom he was methodically starving to death. The supporting role was originally slated for James Cagney until the release of The Public Enemy catapulted him to star status. "His ears are too big and he looks like an ape", said Warner Bros. executive Darryl F. Zanuck about Gable, after testing him for the second male lead in the studio's gangster drama Little Caesar (1931). After his failed screen test for Zanuck, Gable was signed in 1930 by MGM's Irving Thalberg for $650 per week (equivalent to approximately $0 in ). He hired the well-connected Minna Wallis, a sister of producer Hal Wallis, as his agent, whose clients included actresses Claudette Colbert, Myrna Loy and Norma Shearer.

Gable's arrival in Hollywood occurred when MGM was looking to expand its stable of male stars, and he fit the bill. He made two pictures in 1931 with Wallace Beery. In the first, he had a seventh-billed support role in The Secret Six, although his role was much larger than the billing would indicate, then he achieved second billing in a part almost as large as the film's star Beery in the naval aviation film Hell Divers. MGM's publicity manager Howard Strickling started developing Gable's studio image with Screenland magazine playing up his "lumberjack-in-evening-clothes" persona.

To increasing popularity, MGM frequently paired him with well-established female stars. Joan Crawford asked for him to appear with her in Dance, Fools, Dance (1931). The electricity of the pair was recognized by studio executive Louis B. Mayer, who would not only put them in seven more films but also began reshooting Complete Surrender, replacing John Mack Brown as Crawford's leading man and retitling the film Laughing Sinners (1931). His fame and public visibility after A Free Soul (1931), in which he played a gangster who shoved the character played by Norma Shearer, ensured that Gable never played a supporting role again. He received extensive fan mail as a result of his performance; the studio took notice. The Hollywood Reporter wrote "A star in the making has been made, one that, to our reckoning, will outdraw every other star ... Never have we seen audiences work themselves into such enthusiasm as when Clark Gable walks on the screen."

Gable co-starred in Susan Lenox (Her Fall and Rise) (1931) with Greta Garbo, and in Possessed (1931), a film about an illicit romantic affair, with Joan Crawford (who was then married to Douglas Fairbanks Jr.). Adela Rogers St. Johns later dubbed Gable and Crawford's real-life relationship as "the affair that nearly burned Hollywood down". Louis B. Mayer threatened to terminate both their contracts, and for a while, they kept apart when Gable shifted his attentions to Marion Davies as he costarred with her in Polly of the Circus (1932). Gable was considered for the role of Tarzan in Tarzan the Ape Man, but lost out to Johnny Weissmuller's more imposing physique and superior swimming prowess. Gable then starred as the romantic lead in Strange Interlude (1932), again teaming with Shearer, the second of three films they would make together for MGM.

Next, Gable starred with Jean Harlow in the romantic comedy-drama Red Dust (1932) set on a rubber plantation in Indochina. Gable portrayed a plantation manager involved with Harlow's wisecracking prostitute; however, upon her arrival, Gable's character started to pursue Mary Astor's prim, classy newlywed. While some critics thought Harlow stole the show, many agreed that Gable was a natural screen partner.

Gable's "unshaven love-making" with braless Jean Harlow in Red Dust made him MGM's most important romantic leading man. With Gable established as a star, MGM positioned him in the same manner as Harlow for Myrna Loy, a previously lesser billed actor in Night Flight, moving Loy to a costar role in Men in White, a movie filmed in 1933, though delayed in release due to pre-Code Legion of Decency cuts until 1934. The relationship of a doctor (Gable) and nurse (Elizabeth Allan) implied intimacy with a resulting complication of pregnancy, a sensitive issue and new image for Gable.

Gable and Harlow were then teamed in Hold Your Man (1933), China Seas (1935), in which the pair were billed above Wallace Beery, and Wife vs. Secretary (1936) with Myrna Loy costarring and supported by newcomer James Stewart. A popular combination on-screen and off, Gable and Harlow made six films together in five years. Their final film together was Saratoga (1937), a bigger hit than their previous collaborations. Harlow died during its production. The film was ninety percent completed, and the remaining scenes were filmed with long shots or the use of doubles like Mary Dees; Gable said he felt as if he were "in the arms of a ghost".

When MGM head Louis B. Mayer decided that Gable was getting difficult and ungrateful, he loaned Gable out to the lower-rank Columbia studio, for one film It Happened One Night, to teach Gable a lesson, but Columbia wanted him and had paid handsomely for it. The result was that Gable won the Academy Award for Best Actor for his 1934 performance in the film. "Critics praised the fast-paced farce that would enter in a whole new romantic genre: the screwball comedy." Gable's career was revitalized by his whimsical, good-natured performance and to the director Frank Capra, Gable's character in the film closely resembled his real personality. Gable returned to MGM a bigger star than ever. From 1934 until 1942, when World War II interrupted his movie career, he was near the top of the box office money-makers lists.

Gable's first movie role back at MGM was to portray reluctant leader of mutineers Fletcher Christian, an "Englishman in knickers and a three-cornered hat", one he had to be talked into by friend and producer Irving Thalberg, and of which Gable said "I stink in it" after filming. Mutiny on the Bounty (1935) was a critical and commercial success, receiving eight Academy Award nominations. There were three Best Actor nominations for stars Gable, Charles Laughton and Franchot Tone, and the film won Best Picture, the second of three films in which Gable played a leading role to do so. The film cost $2 million and grossed $4.5 million, making it one of the top moneymakers that decade. It used life-size replicas of the Bounty and Pandora, and was partly filmed in Catalina and French Polynesia.

1936–1939: Tracy collaborations and Gone with the Wind
Gable made three pictures with Spencer Tracy, which boosted Tracy's career and permanently cemented them in the public mind as a team. San Francisco (1936), with Jeanette MacDonald, featured Tracy for only 17 minutes in an Oscar-nominated portrayal of a Catholic priest who knocks Gable down in a boxing ring. The film was a box office hit and remains the third-highest-grossing film of Gable's career. Their next film together was the Academy Award–nominated box office success Test Pilot (1938), with Myrna Loy, who made seven pictures with Gable. He plays Jim Lane, the test pilot of the title; Tracy is his sidekick mechanic, Gunner Morse.

For their final film, 1940's Boom Town, Tracy would play a larger role, with billing directly under Gable and above Claudette Colbert and Hedy Lamarr. The picture, a lavish epic about two oil wildcatters who become partners then rivals, was a box office success, earning $5 million. Gable and Tracy were off-screen friends; Tracy was one of the few Hollywood industry luminaries who attended Lombard's private funeral. After Boom Town no more Gable-Tracy partnerships were possible; Tracy's success led to a new contract and both stars had conflicting stipulations requiring top billing in MGM movie credits and on promotional posters.

Despite his reluctance to play the role, Gable is best known for his Oscar-nominated performance in the Academy Award-winning best picture Gone with the Wind (1939). Carole Lombard may have been the first to suggest that he play Rhett Butler (and she play Scarlett) when she bought him a copy of the best-seller, which he refused to read. His total salary was $117,917 for the film ($0 in ).

Butler's last line in Gone with the Wind, "Frankly, my dear, I don't give a damn", is one of the most famous lines in movie history. Gable was an almost immediate favorite for the role of Rhett with both the public and producer David O. Selznick. Since Selznick had no male stars under long-term contract, he needed to negotiate with another studio to borrow an actor. Gary Cooper was Selznick's first choice. When Cooper turned down the role of Butler, he was quoted as saying, "Gone With the Wind is going to be the biggest flop in Hollywood history. I'm glad it'll be Clark Gable who's falling flat on his nose, not me." By then, Selznick had become determined to hire Gable, and set about finding a way to borrow him from MGM. Gable was wary of potentially disappointing an audience that had decided that no one else could play the part. He later conceded, "I think I know now how a fly must react after being caught in a spider's web."

According to Lennie Bluett, an extra in the film, Gable almost walked off the set when he discovered the studio facilities were segregated and signage posted "White" and "Colored". Gable phoned the film's director Victor Fleming and told him, "If you don't get those signs down, you won't get your Rhett Butler." The signs were then taken down. Gable tried to boycott the Gone with the Wind premiere in segregated Atlanta, because African American actors Hattie McDaniel and Butterfly McQueen were not permitted to attend. He reportedly only went after McDaniel pleaded with him to go. They appeared in several more films, remaining life-long friends and he always attended her Hollywood parties.

Gable did not want to shed tears for the scene after Rhett inadvertently causes Scarlett to miscarry their second child. Olivia de Havilland made him cry, later commenting, "Oh, he would not do it. He would not! Victor (Fleming) tried everything with him. He tried to attack him on a professional level. We had done it without him weeping several times and then we had one last try. I said, 'You can do it, I know you can do it, and you will be wonderful...' Well, by heaven, just before the cameras rolled, you could see the tears come up at his eyes and he played the scene unforgettably well. He put his whole heart into it." The role was one of Gable's most layered performances and partially based on the personality of director and friend Fleming.

Years later, Gable said that whenever his career would start to fade, a re-release of Gone with the Wind would soon revive his popularity, and he continued as a top leading actor for the rest of his life. One reissue publicized "Clark Gable never tires of holding Vivien Leigh".

1939–1942: Established star
Between his marriage to Lombard and her death, Gable again costarred with Norma Shearer in the World War II romantic intrigue film, Idiot's Delight (1939). He plays a nightclub singer that doesn't recognize former love (Shearer) while Nazis are closing in on guests at a hotel on the brink of war. The film is memorable for Gable's song and dance routine, "Puttin' on the Ritz" and an alternative ending. Gable also starred in Strange Cargo (1940), a romantic drama with Joan Crawford, costarring Peter Lorre and Ian Hunter. The film's focus is on Gable and French Devil's Islands convicts in an escape from the penal colony, who on the way pick up a local entertainer (Crawford) whom Gable had met earlier in the movie. In their eighth and last film together, Gable and Crawford "again demonstrated their on-screen magic" and the film was among the top ten grossing films for the year.

Gable then made his first film with 20-year old Lana Turner, a newcomer whom MGM saw as a successor for both Crawford and the now-deceased Jean Harlow. Honky Tonk (1941) is a western where Gable's con-man/gambler character romances Turner, a prim, young judge's daughter. , Gable had been reluctant to act opposite the younger Turner in the required romantic scenes. But their chemistry served them well in this and three later films, with Honky Tonk finishing third at the box office that year.

Since the couple had been popular with the public, Gable and Turner were quickly paired again in Somewhere I'll Find You (1941) as war correspondents who travel to the Pacific theatre and get caught up in a Japanese attack. The movie was another hit finishing No. 8 at the box office for 1942. Film historian David Thomson wrote the quality of his movies after Gone With the Wind "hardly befitted a national idol" and began a career decline for Gable.

1942–1944: World War II
On August 12, 1942, following Lombard's death and completion of the film Somewhere I'll Find You, Gable joined the United States Army, under the Army Air Forces. Lombard had suggested that Gable enlist as part of the war effort, but MGM was reluctant to let him go. Commanding General of the U.S. Army Air Forces Henry H. "Hap" Arnold offered Gable a "special assignment" with the First Motion Picture Unit following basic training. The Washington Star reported that Gable took a physical examination at Bolling Field on June 19, preliminary to joining the service.

"'Mr. Gable, it was learned from a source outside the war department, conferred with Lieutenant General H. H. Arnold, head of the air forces yesterday.' The Star continued, 'It was understood that Mr. Gable, if he is commissioned, will make movies for the air forces. Lieutenant Jimmy Stewart, another actor in uniform, has been doing this.'"

Gable had expressed an earlier interest in officer candidate school, with the intention of becoming an aerial gunner upon enlisting in bomber training school. MGM arranged for his studio friend, the cinematographer Andrew McIntyre, to enlist with him and accompany him through training.

On August 17, 1942, shortly after his enlistment, he and McIntyre were sent to Miami Beach, Florida, where they entered USAAF OCS Class 42-E. Both completed training on October 28, 1942, and were commissioned as second lieutenants. His class of about 2,600 students (of which he ranked about 700th) selected Gable as its graduation speaker. General Arnold presented the cadets with their commissions. Arnold then informed Gable of his special assignment: to make a recruiting film in combat with the Eighth Air Force to recruit aerial gunners. Gable and McIntyre were immediately sent to Flexible Gunnery School at Tyndall Field, Florida, followed by a photography course at Fort George Wright, Washington State and promoted to first lieutenants upon its completion.

On January 27, 1943, Gable reported to Biggs Army Airfield, Texas to train with and accompany the 351st Bomb Group to England as head of a six-man motion picture unit. In addition to McIntyre, he recruited the screenwriter John Lee Mahin, camera operators Sgts. Mario Toti and Robert Boles, and the sound man Lt. Howard Voss, to complete his crew. Gable was promoted to captain while he was with the 351st Bomb Group at Pueblo Army Air Base, Colorado, a rank commensurate with his position as a unit commander. (Prior to this, he and McIntyre were both first lieutenants.)

Gable spent most of 1943 in England at RAF Polebrook with the 351st Bomb Group. Gable flew five combat missions, including one to Germany, as an observer-gunner in B-17 Flying Fortresses between May 4 and September 23, 1943, earning the Air Medal and the Distinguished Flying Cross for his efforts. During one of the missions, Gable's aircraft was damaged by flak and attacked by fighters, which knocked out one of the engines and shot up the stabilizer. In the raid on Germany, one crewman was killed and two others were wounded, and flak went through Gable's boot and narrowly missed his head. When word of this reached MGM, studio executives began to badger the Army Air Forces to reassign its most valuable screen actor to noncombat duty. Many of the men he served with, such as former Tech. Sgt. Ralph Cowley, said Gable actually unofficially joined other missions and the above five were only a fraction of the total. Adolf Hitler favored Gable above all other actors. During World War II, Hitler offered a sizable reward to anyone who could capture and bring Gable to him unscathed.

In November 1943, Gable returned to the United States to edit his film, on an old Warner's lot donated to the war effort, assigned to the 18th AAF Base Unit (Motion Picture Unit) at Culver City, California, where other stars contributed with any film equipment they had as well. In June 1944, Gable was promoted to major. While he hoped for another combat assignment, he had been placed on inactive duty and on June 12, 1944, his discharge papers were signed by Captain (later U.S. president) Ronald Reagan. Gable completed editing of the film Combat America in September 1944, giving the narration himself and making use of numerous interviews with enlisted gunners as focus of the film.

Because his motion picture production schedule made it impossible for him to fulfill reserve officer duties, he resigned his commission on September 26, 1947, a week after the Air Force became an independent service branch. Gable was awarded military honors for service: the Distinguished Flying Cross, Air Medal, American Campaign Medal, European-African-Middle Eastern Campaign Medal, and World War II Victory Medal. He was a qualified aerial gunner having received his wings upon completion of flexible gunnery school at Tyndall field.

1945–1953: After World War II
Immediately after his discharge from the service, Gable returned to his ranch and rested. Personally, he resumed a pre-war relationship with Virginia Grey, a co-star from Test Pilot and Idiot's Delight, that newspapers reported might be the next Mrs. Gable. Professionally, Gable's first movie after World War II was Adventure (1946), with Greer Garson, by then the leading female star at MGM. Given the famous teaser tagline "Gable's back, and Garson's got him", the film was a commercial hit, earning over $6 million, but a critical failure.

Gable was acclaimed for his performance in The Hucksters (1947), a satire of post-war Madison Avenue corruption and immorality, which co-starred Deborah Kerr and Ava Gardner. The film was popular with audiences, placing 11th at the box office, but both Variety and The New York Times reviewed it as a sanitized version of the novel with script issues, that was heavy on Gable screentime, who struggled in the role. Gable followed this up with Homecoming (1948), where he played a married doctor enlisting in World War II and meeting Lana Turner's army surgical nurse character with a romance unfolding in flashbacks. After that he made the war film Command Decision (1948), a psychological drama with Walter Pidgeon, Van Johnson, Brian Donlevy, and John Hodiak. It was a hit with audiences, but it lost MGM money due to the high cost of the all-star cast. Variety said, "[Gable's] is a believable delivery, interpreting the brigadier-general who must send his men out to almost certain death with an understanding that bespeaks his sympathy with the soldier... ".

A very public and brief romance with Paulette Goddard occurred after that. In 1949, Gable married Sylvia Ashley, a British model and actress previously married to Douglas Fairbanks Sr. The relationship was profoundly unsuccessful; they divorced in 1952. Gable did a series of films with female co-stars: Any Number Can Play (1950) with Alexis Smith, Key to the City (1950) with Loretta Young, and To Please a Lady (1950) with Barbara Stanwyck. They were reasonably popular, but he had more success with two Westerns: Across the Wide Missouri (1951), and Lone Star (1952). He then made Never Let Me Go (1953) opposite Gene Tierney. Tierney was a favorite of Gable's, and he was very disappointed when her mental health problems caused her to be replaced in Mogambo by Grace Kelly.

Mogambo (1953), directed by John Ford, was a somewhat sanitized and more action-oriented remake of Gable's hit pre-Code film Red Dust, with Jean Harlow and Mary Astor. Ava Gardner, in her third and final pairing with Gable, was well received in Harlow's leading lady role, as was Kelly in Astor's role, with both receiving Academy Award nominations, Gardner for Lead Actress and Kelly for Supporting Actress. While on location in Africa, reports of an affair between Gable and Kelly began to surface (the result of private dinners the stars were having), but their relationship was an intense friendship according to costar Gardner, with Kelly herself later commenting on the lack of any sexual aspect, "maybe because of the age difference". The publicity only helped ticket sales as the film finished No. 7 at the box office, grossing 8.2 million for the year, easily his most popular hit since he returned to MGM after the war.

1954–1957: Leaving MGM
Despite the positive critical and public response to Mogambo, Gable became increasingly unhappy with what he considered mediocre roles offered by MGM, while the studio regarded his salary as excessive. Studio head Louis B. Mayer was fired in 1951, amid slumping revenue and increased Hollywood production costs, due in large part to the rising popularity of television. The new studio head, former production chief Dore Schary, struggled to maintain profits for the studio. Many long-time MGM stars were fired, or their contracts were not renewed, including Greer Garson and Judy Garland. Gable refused to renew his contract. His last film at MGM was Betrayed (1954), an espionage wartime drama with Turner and Victor Mature. Critic Paul Mavis wrote, "Gable and Turner just don't click the way they should here...poor plots and lines never stopped these two pros from turning in good performances in other films." In March 1954, Gable left MGM.

His next two films were made for 20th Century Fox: Soldier of Fortune, an adventure story in Hong Kong with Susan Hayward, and The Tall Men (1955), a Western with Jane Russell and Robert Ryan. Both were profitable, although only modest successes, earning Gable his first profit sharing royalties. In 1955, Gable would be 10th at the box office – the last time he was in the top ten. That same year, Gable married fifth wife Kay Spreckels (née Kathleen Williams). A former fashion model and actress, she had previously been married three times: first to Charles Capps (1937–39), then to Argentinian cattle tycoon Martín de Alzaga (1942–43), and to sugar-refining heir Adolph B. Spreckels Jr. (1945–52). Gable became stepfather to her son Bunker Spreckels, who went on to live a notorious celebrity lifestyle in the late 1960s and early 1970s surfing scene, ultimately leading to his early death in 1977.

Gable also formed Russ-Field-Gabco in 1955, a production company with Jane Russell and her husband Bob Waterfield, and they produced The King and Four Queens (1956), a film Gable thought would also star Russell to capitalize on The Tall Men 's moderate success. That role instead went to Jo Van Fleet. It was Gable's only time as producer. He found producing and acting to be too much work and this Raoul Walsh western was the only film made. After turning down the lead role in Universal-International's Away All Boats, his next project was the Warner Bros. production Band of Angels (1957), co-starring Yvonne De Carlo and featuring relative newcomer Sidney Poitier; it was not well received, despite Gable's role's similarities to Rhett Butler. Newsweek said, "Here is a movie so bad that it must be seen to be disbelieved."

1958–1961: Paramount and The Misfits
Next, he paired with Doris Day in Teacher's Pet (1958), shot in black and white at Paramount. He did Run Silent, Run Deep (also 1958), with co-star and producer Burt Lancaster, which featured his first on-screen death since 1937, and which garnered good reviews. Gable started to receive television offers, but rejected them outright. At 57, Gable finally acknowledged, "Now it's time I acted my age". His contracts began including a clause that his filming and work days ended at 5 p.m.

His next two films were light comedies for Paramount: But Not for Me (1959) with Carroll Baker, and It Started in Naples (1960) with Sophia Loren. Naples was written and directed by Melville Shavelson and it mainly showed the beauty of Loren and the Italian island Capri. It was a box-office success and was nominated for an Academy Award for art direction and two Golden Globes, one for picture and Loren for actress in a leading role. Filmed mostly on location in Italy, it was Gable's last film released in color. While there Gable's weight had increased to 230 pounds, something he credited to pasta, and he started on a crash diet to achieve a goal weight of 195, along with briefly quitting drinking and smoking, to pass a required physical for his next movie.

On February 8, 1960, Gable received a star on the Hollywood Walk of Fame for his work in motion pictures, located at 1608 Vine Street.

Gable's last film was The Misfits (1961), with a script by Arthur Miller and directed by John Huston. Co-starring with Gable were Marilyn Monroe (in her last completed film), Montgomery Clift, Eli Wallach and Thelma Ritter. Many critics regard Gable's performance to be his finest, and Gable, after seeing the rough cuts, agreed, although the film did not receive any Oscar nominations. Miller wrote the screenplay for his wife Monroe; it was about two aging cowboys and a pilot that go mustanging in Reno, Nevada, who all fall for a blonde. In 1961, it was a somewhat disconnected film with its antihero western themes, but it has since become a classic.

Portraitist Al Hirschfeld created a drawing, and then a lithograph, portraying the film's stars Clift, Monroe, and Gable with screenwriter Miller, in what is suggested as a typical "on-the-set" scene during the troubled production. In a 2002 documentary Eli Wallach recalled the mustang wrangling scenes Gable insisted on performing himself, "You have to pass a physical to film that" and "He was a professional going home at 5 p.m. to a pregnant wife". The New York Times found "Mr. Gable's performance as a leathery old cowboy with a realistic slant on most plain things" ironically vital, with his death before the film's release.

Filmography
Gable is known to have appeared as an "extra" in 13 films between 1924 and 1930. He then appeared in a total of 67 theatrically released motion pictures, as himself in 17 "short subject" films, and he narrated and appeared in a 1945 World War II propaganda film entitled Combat America, produced by the United States Army Air Forces.

Gable was one of the most consistent box-office performers in the history of Hollywood, appearing on Quigley Publishing's annual Top Ten Money Making Stars Poll sixteen times. He appeared opposite many of the most popular actresses of their time. Joan Crawford was a favorite actress of his to work with, and he partnered with her in eight films. Myrna Loy worked with him seven times, and he was paired with Jean Harlow in six productions. He also starred with Lana Turner in four features, and in three each with Norma Shearer and Ava Gardner. Gable died of a heart attack at the age of 59; his final on-screen appearance was as an aging cowboy in The Misfits, released posthumously in 1961.

Marriages and children
Gable married five times and was linked romantically to many other women. His first engagement was to actress Franz Dorfler when he was about 21. Dorfler introduced Gable to Josephine Dillon, who would become his acting coach, manager, and then his wife. When Gable and Dillon married on December 13, 1924 in California, Gable was 23 and Dillon was 40; the couple divorced in 1930. His second wife was Texas socialite Maria Franklin Prentiss Lucas Langham Gable (nicknamed "Ria"). The couple married on June 19, 1931 in California and divorced on March 7, 1939. Thirteen days after his divorce from Maria, Gable married actress Carole Lombard during a production break on Gone with the Wind.

 Carole Lombard  Gable's relationship with and marriage in 1939 to his third wife, actress Carole Lombard (1908–1942), was one of the happiest periods of his personal life. They met while filming 1932's No Man of Her Own, when Lombard was still married to actor William Powell. A Gable and Lombard romance did not take off until 1936, after becoming reacquainted at a party. They were soon inseparable, with fan magazines and tabloids citing them as an official couple.

Gable thrived being around Lombard's youthful, charming, and frank personality, once stating: "You can trust that little screwball with your life or your hopes or your weaknesses, and she wouldn't even know how to think about letting you down."

Gable was still legally married, having prolonged an expensive divorce from his second wife, Ria Langham, until his salary from Gone with the Wind enabled him to reach a divorce settlement with her on March 7, 1939. On March 29, during a production break on Gone with the Wind, Gable and Lombard were married in Kingman, Arizona, and honeymooned in room 1201 of the Arizona Biltmore Hotel. They purchased a ranch previously owned by director Raoul Walsh in Encino, California, for $50,000 making it their home. The couple, who lovingly referred to each other as "Ma and Pa", owned a menagerie of animals and raised chickens and horses there.

With the bombing of Pearl Harbor many Hollywood stars joined the war effort, some such as James Stewart signing up for active duty. Carole Lombard sent a telegram to President Roosevelt on behalf of Gable expressing his interest in doing so, but F.D.R. thought the 41-year-old actor could best serve by increased patriotic roles in movies and bond drives, which Lombard tirelessly began.

On January 16, 1942, Lombard was a passenger on Transcontinental and Western Air Flight 3 with her mother and press agent Otto Winkler. She had just finished her 57th movie, To Be or Not to Be, and was on her way home from a successful war bond selling tour when the flight's Douglas DC-3 airliner crashed into Potosi Mountain near Las Vegas, Nevada, killing all 22 passengers aboard, including 15 servicemen en route to training in California. Gable flew to the crash site to claim the bodies of his wife, mother-in-law, and Winkler, who had been the best man at Gable and Lombard's wedding. Lombard was declared to be the first war-related American female casualty of World War II, and Gable received a personal note of condolence from President Roosevelt. The Civil Aeronautics Board investigation into the crash concluded that pilot error was its cause.

Gable returned to their Encino ranch and carried out her funeral wishes as she had requested in her will. A month later, he returned to the studio to work with Lana Turner in their second movie together, Somewhere I'll Find You. Having lost 20 pounds since the tragedy, Gable evidently was emotionally and physically devastated, but Turner stated that Gable remained a "consummate professional" for the duration of filming. He acted in 27 more films, and remarried twice more. "But he was never the same", according to Esther Williams. "He had been devastated by Carole's death."

 Sylvia Ashley

In 1949, Gable married Sylvia Ashley, an English model and actress who was the widow of Douglas Fairbanks; the couple divorced in 1952.

 Kay Spreckels

In 1955, Gable married Kay Spreckels (née Kathleen Williams), a thrice-married former fashion model and actress who had previously been married to sugar-refining heir Adolph B. Spreckels Jr.

Four months after his 1960 death, Kay Gable gave birth to his only biological son, John Clark Gable. John Clark raced cars and trucks most notably in the Baja 500 and 1000, turning down Hollywood offers to act until Bad Jim (1990), a straight-to-video film. By 1999, his work with the Clark Gable Foundation helped restore the house in which his father was born in Cadiz, Ohio, and open it as a museum. John Clark had two children: Kayley Gable (born 1986) and Clark James Gable (1988–2019). Kayley is an actress, while Clark James was the host of two seasons of the nationally syndicated reality show Cheaters. Clark James died of a drug overdose at age 30 on February 22, 2019.

 Relationship with Loretta Young

During the filming of The Call of the Wild in early 1935, the film's lead actress, Loretta Young, became pregnant with Gable's child. Clark Gable had allegedly slept with Young while on an overnight train from a studio location to Hollywood. Their daughter, Judy Lewis, was born on November 6, 1935, in Venice, California. Young hid her pregnancy in an elaborate scheme. Nineteen months after the birth, she claimed to have adopted the baby. Most in Hollywood (and some in the general public) believed Gable was Lewis's father because of their strong resemblance and the timing of her birth. In 1950, Gable came to her mother's house to visit her briefly. Gable asked Lewis about her life and then, upon leaving, kissed her on her forehead. It was the only time that Lewis ever spoke to Gable and, at the time, she had no idea that he was her father.

As an adult, Lewis spoke of the confusion, isolation and alienation she felt within her own family while growing up. Five years after Gable's death, when confronted by Judy Lewis, Loretta Young said that she was Lewis' biological mother and that Gable was her father by an affair. Young died on August 12, 2000; her autobiography, published posthumously, confirmed that Gable was indeed Lewis' father. Judy Lewis died of cancer at age 76 on November 25, 2011. In 2015, Young's daughter-in-law alleged that Young had said in 1998 that Judy Lewis was conceived by date rape. Young had previously admitted to an affair with Gable, which was a known secret in Hollywood at the time. Young's family had chosen to remain silent about the information until both Young and Lewis were deceased; they went public with the information four years after Lewis' death.

Politics
Gable was a conservative Republican. In 1944, Gable became an early member of the conservative Motion Picture Alliance for the Preservation of American Ideals, a group explicitly created to help root out Communists from the film industry. In addition to Gable, its members included such industry heavyweights as Walt Disney, Ayn Rand, Ronald Reagan, and John Wayne; they helped create and enforce the Hollywood blacklist, often by testifying under oath before the House Un-American Activities Committee.

In 1933, Gable was initiated into Freemasonry at the Beverly Hills Lodge No. 528 CA.

Illness and death

On November 6, 1960, Gable was sent to Hollywood Presbyterian Medical Center in Los Angeles, where doctors found that he had suffered a heart attack. Newspaper reports the following day listed his condition as satisfactory. By the morning of November 16, he seemed to be improving, but he died that evening at the age of 59 from a second heart attack caused by an infection. Medical staff did not perform cardiopulmonary resuscitation for fear that the procedure would rupture Gable's heart, and a defibrillator was not available.

Gable is interred in the Great Mausoleum, Memorial Terrace, at Glendale's Forest Lawn Memorial Park next to Carole Lombard and her mother. An honor guard and pallbearers Spencer Tracy and James Stewart were in attendance. Twenty-two years later Kay Gable died and was interred there as well.

Style and reception
In a photo essay of Hollywood film stars, Life magazine called Gable, "All man ... and then some."

Doris Day summed up Gable's unique personality: "He was as masculine as any man I've ever known, and as much a little boy as a grown man could be —it was this combination that had such a devastating effect on women."

An eight-time co-star, long-time friend and on-again, off-again romance, Joan Crawford concurred, stating on David Frost's TV show in January 1970 that, "He was a king wherever he went. He earned the title. He walked like one, he behaved like one, and he was the most masculine man that I have ever met in my life. Gable had balls." Robert Taylor said Gable "was a great, great guy, and certainly one of the great stars of all times, if not the greatest. I think that I sincerely doubt that there will ever be another like Clark Gable; he was one of a kind."

In his memoir Bring on the Empty Horses, David Niven states that Gable, a close friend, was extremely supportive after the sudden, accidental death of Niven's first wife, Primula (Primmie), in 1946. Primmie had supported Gable emotionally after Carole Lombard's death four years earlier: Niven recounts Gable kneeling at Primmie's feet and sobbing while she held and consoled him. Niven also states that Arthur Miller, the author of The Misfits, had described Gable as "the man who did not know how to hate."

Gable has been criticized for altering aspects of a script he felt were in conflict with his image. Screenwriter Larry Gelbart, as quoted in James Garner's biography stated that Gable, "... refused to go down with the submarine, because Gable doesn't sink." (In reference to Gable's film Run Silent, Run Deep). The novel's author, Capt. Beach, noted changes should be made among the crew to get a Hollywood audience and where a subsequent battle sequence was altered when he should have had script approval, feeling his book was bought by United Artists for its title.

Eli Wallach recalls in his 2006 autobiography The Good, The Bad and Me, that what he felt was one of his best dramatic scenes in The Misfits was cut from the script. Wallach's character is emotionally crushed when he visits Roslyn (Marilyn Monroe), and instead runs into Gable's character and realizes any hope with Roslyn is dashed. Gable asked (within his contractual rights) that the scene be removed, and when Wallach spoke to him, Gable explained he felt that "his character would never steal a woman from a friend."

In popular culture
Warner Bros. cartoons sometimes caricatured Gable. Examples include: Have You Got Any Castles? (in which his face appears seven times inside the novel The House of the Seven Gables), The Coo-Coo Nut Grove (in which his ears flap on their own), Hollywood Steps Out (in which he follows an enigmatic woman), and Cats Don't Dance (in which he appears on a billboard promotion for Gone with the Wind and on the backlot of MGM).

Along with actor Kent Taylor, Clark Gable served as the inspiration behind the name of Superman's alter-ego Clark Kent.

Bugs Bunny's nonchalant carrot-chewing standing position, as explained by Chuck Jones, Friz Freleng, and Bob Clampett, originated in a scene in the film It Happened One Night (1934), in which Clark Gable's character leans against a fence, eating carrots rapidly and talking with his mouth full to Claudette Colbert's character. This scene was well known while the film was popular, and viewers at the time likely recognized Bugs Bunny's behavior as parody.

In January 1937, Gable was honored with a block in the forecourt of Grauman's Chinese Theatre.

In the 1937 film Broadway Melody of 1938, Judy Garland (aged 15) sings "You Made Me Love You" while looking at a composite picture of Gable. The opening lines are: "Dear Mr Gable, I am writing this to you, and I hope that you will read it so you'll know, my heart beats like a hammer, and I stutter and I stammer, every time I see you at the picture show, I guess I'm just another fan of yours, and I thought I'd write and tell you so. You made me love you, I didn't want to do it, I didn't want to do it..."

The 1948 Cole Porter tune "Always True to You in My Fashion" contains the lyrics "Mister Gable, I mean Clark / Wants me on his boat to park".

The 1975 film Monty Python and the Holy Grail contained a reference to impersonating Gable in the song performed by the Knights of the Round Table.

The 2003 music album Give Up by The Postal Service has a song titled "Clark Gable". The singer wants to "find a love that looks and sounds like a movie", and includes the lyric, "I kissed you in a style Clark Gable would have admired, I thought it classic".

Gable has been portrayed in a number of films. Actors who have played the role include: Phillip Waldron in It Happened in Hollywood (1937), James Brolin in Gable and Lombard (1976), Larry Pennell in Marilyn: The Untold Story (1980), Edward Winter in Moviola: The Scarlett O'Hara War (1980), Boyd Holister in Grace Kelly (1983), Gary Wayne in Malice in Wonderland (1985), Gene Daily in The Rocketeer (1991), Bobby Valentino in RKO 281 (1999), Bruce Hughes and Shayne Greenman in Blonde (2001), and Charles Unwin in Lucy (2003).

In Drunk History Season 3 2015 Miami episode 2, Josh Hartnett portrays Gable. The focus is on Gable's military service and his training in Miami.

title: Clark Gable