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Reynoutria japonica

Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a species of herbaceous perennial plant in the knotweed and buckwheat family Polygonaceae. Common names include Japanese knotweed and Asian knotweed. It is native to East Asia in Japan, China and Korea. In North America and Europe, the species has successfully established itself in numerous habitats, and is classified as a pest and invasive species in several countries. The plant is popular with beekeepers, and its young stems are edible, making it an increasingly popular foraged vegetable with a flavour described as lemony rhubarb.

Description
The flowers are small, cream or white, produced in erect racemes 6 – long in late summer and early autumn. Japanese knotweed has hollow stems with distinct raised nodes that give it the appearance of bamboo, though it is not related. While stems may reach a maximum height of 3 – each growing season, it is typical to see much smaller plants in places where they sprout through cracks in the pavement or are repeatedly cut down. The leaves are broad oval with a truncated base, 7 – long and 5 – broad, with an entire margin. New leaves of Reynoutria japonica are dark red and 1 to 4 cm long; young leaves are green and rolled back with dark red veins; leaves are green and shaped like a heart flattened at the base, or a shield, and are usually around 12 cm long.

Mature R.japonica forms 2 to 3 m, dense thickets. Leaves shoot from the stem nodes alternately in a zigzag pattern. Plants that are immature or affected by mowing and other restrictions have much thinner and shorter stems than mature stands, and are not hollow.

Identification
Identification of Japanese knotweed may be confused with other plants suspected of being knotweed, due often to the similar appearance of leaves and stems. Dogwood, lilac, houttuynia (Houttuynia cordata), ornamental bistorts such as red bistort (Persicaria amplexicaulis), lesser knotweed (Koenigia campanulata), Himalayan balsam (Impatiens glandulifera), broad-leaved dock (Rumex obtusifolius), bindweed (Convolvulus arvensis), bamboo, Himalayan honeysuckle (Leycesteria formosa), and Russian vine (Fallopia baldschuanica) have been suspected of being Reynoutria japonica.

Uses

Japanese knotweed flowers are valued by some beekeepers as an important source of nectar for honeybees, at a time of year when little else is flowering. Japanese knotweed yields a monofloral honey, usually called bamboo honey by northeastern U.S. beekeepers, like a mild-flavored version of buckwheat honey (a related plant also in the Polygonaceae).

The young stems are edible as a spring vegetable, with a flavour similar to rhubarb. In some locations, semi-cultivating Japanese knotweed for food has been used as a means of controlling knotweed populations that invade sensitive wetland areas and drive out the native vegetation. It is eaten in Japan as sansai or wild foraged vegetable. In Europe, young shoots have been used in restaurant cuisine.

Knotweed can grow up to 30 cm per day, hence it is a fast-growing vegetable tolerant of poor quality soils. Because knotweed is resistant to over-harvesting, it is more often foraged than cultivated as a vegetable. The plant can be eaten raw or cooked.

Ground-feeding songbirds and gamebirds also eat the seeds.

Rhizome of R. japonica is the source of lactoperoxidase peroxidation cycle substrates, which can act as activators and inhibitors of the antimicrobial properties of that system.

In Japan
It grows widely throughout Japan and is foraged as a wild edible vegetable (sansai), though not in sufficient quantities to be included in statistics. They are called by such regional names as tonkiba (Yamagata), itazuiko (Nagano, Mie), itazura (Gifu, Toyama, Nara, Wakayama, Kagawa), gonpachi (Shizuoka, Nara, Mie, Wakayama), sashi (Akita, Yamagata), jajappo (Shimane, Tottori, Okayama), sukanpo (many areas).

Young leaves and shoots, which look like asparagus, are used. They are extremely sour; the fibrous outer skin must be peeled, soaked in water for half a day raw or after parboiling, before being cooked.

Invasive species
This species is listed by the World Conservation Union as one of the world's worst invasive species.

It is a frequent colonizer of temperate riparian ecosystems, roadsides, and waste places. It forms thick, dense colonies that completely crowd out any other herbaceous species and is now considered one of the worst invasive exotics in parts of the eastern United States. The success of the species has been partially attributed to its tolerance of a very wide range of conditions, including drought, different soil types, variable soil pH, and high salinity. Its rhizomes can survive temperatures of -35 °C and can extend 7 m horizontally and 3 m deep, making removal by excavation extremely difficult. The plant is also resilient in response to cutting, vigorously resprouting from the roots.

Impact
Japanese Knotweed (Reynoutria japonica) has a strong and extensive root system that can penetrate through the cracks of hard surfaces such as concrete, asphalt, and brick. As the plant grows, it can cause significant damage to building foundations, walls, and drainage systems, which can be very costly to repair. Its invasive roots can also damage concrete foundations, buildings, roads, paving, retaining walls, and architectural sites. Additionally, the plant's dense growth can impede water flow, increasing the risk of flooding by reducing the capacity of flood channels to carry water.

Recent reporting suggests that Japanese knotweed is not nearly as destructive to structures as once thought. Damage appears to only occur at or near areas that were already compromised.

Japanese knotweed shades out other vegetation, grows over buildings and other structures, encourages fire, and damages paved surfaces.

Control
Japanese knotweed has a large underground network of roots (rhizomes). To eradicate the plant the roots need to be killed. All above-ground portions of the plant need to be controlled repeatedly for several years in order to weaken and kill the entire patch. Picking the right herbicide is essential, as it must travel through the plant and into the root system below. But also more ecologically friendly means are being tested as an alternative to chemical treatments.

Chemical
The abundance of the plant can be significantly reduced by applying glyphosate, imazapyr, a combination of both, or by cutting all visible stalks and filling the stems with glyphosate. However, these methods have not been proven to provide reliable long-term results in eliminating the treated population.

Mechanical
Digging up the rhizomes is a common solution where the land is to be developed, as this is quicker than the use of herbicides, but safe disposal of the plant material without spreading it is difficult; knotweed is classed as controlled waste in the UK, and disposal is regulated by law. Digging up the roots is also very labour-intensive and not always effective. The roots can extend up to 10 ft deep, and leaving even just a few centimetres (inches) of root behind will result in the plant quickly growing back.

Covering the affected patch of ground with a non-translucent material can be an effective follow-up strategy. However, the trimmed stems of the plant can be razor sharp and are able to pierce through most materials. Covering with non-flexible materials such as concrete slabs has to be done meticulously and without leaving even the smallest splits. The slightest opening can be enough for the plant to grow back.

Soil steam sterilization involves injecting steam into contaminated soil in order to kill subterranean plant parts.

Trials in Haida Gwaii, British Columbia, using sea water sprayed on the foliage, have not demonstrated promising results.

Biological
Research has been carried out on a Mycosphaerella leaf spot fungus, which devastates knotweed in its native Japan. This research has been relatively slow due to the complex life cycle of the fungus.

Following earlier studies, imported Japanese knotweed psyllid insects Aphalara itadori, whose only food source is Japanese knotweed, were released at a number of sites in Britain in a study running from 1 April 2010 to 31 March 2014. In 2012, results suggested that establishment and population growth were likely, after the insects overwintered successfully. In 2020 Amsterdam imported and released 5,000 Japanese Aphalara itadori leaf fleas, exempting them from a strict ban on the introduction of alien species, as one of the measures to contain the knotweed. The psyllids suck up sap from the plant, potentially killing young shoots and slowing or even stopping growth. It was hoped that the psyllid would hibernate over winter and establish themselves in 2021.

Anecdotal reports of effective control describe the use of goats to eat the plant parts above ground followed by the use of pigs to root out and eat the underground parts of the plant.

New Zealand
Japanese knotweed is classed as an unwanted organism in New Zealand and is established in some parts of the country.

Europe

European adventurer Philipp Franz von Siebold transported Japanese knotweed from a Japanese volcano to Leiden in the Netherlands. By 1850, a specimen from this plant was donated by Von Siebold to the Royal Botanic Gardens, Kew. It was favoured by gardeners because it looked like bamboo and grew everywhere. Ann Conolly provided the first authoritative work on the history and distribution of the plant in the UK and Europe in the 1970s. According to The Daily Telegraph, the weed has travelled rapidly, aided by rail and water networks. In the UK, Japanese knotweed is a single female clone. However, it is able to readily hybridise with related species.

In the UK, Japanese knotweed is established in the wild in many parts of the country and creates problems due to the impact on biodiversity, flooding management and damage to property. It is an offence under section 14(2) of the Wildlife and Countryside Act 1981 to "plant or otherwise cause to grow in the wild" any plant listed in Schedule nine, Part II to the Act, which includes Japanese knotweed. As of 2014, householders and landlords within towns, who do not control the plant in their gardens, can receive an on-the-spot fine or be prosecuted. It is also classed as "controlled waste" in Britain under part 2 of the Environmental Protection Act 1990. This requires disposal at licensed landfill sites.

Some home owners in the United Kingdom are unable to sell their homes if there is any evidence of knotweed on the property. The species is expensive to remove. According to the UK government, the cost of controlling knotweed had hit £1.25 billion in 2014. It cost £70 million to eradicate knotweed from 10 acres of the London 2012 Olympic Games velodrome and aquatic centre. Defra's Review of Non-native Species Policy states that a national eradication programme would be prohibitively expensive at £1.56 billion. The Centre for Ecology and Hydrology has been using citizen science to develop a system that gives a knotweed risk rating throughout Britain.

The decision was taken on 9 March 2010 in the UK to release into the wild a Japanese psyllid insect, Aphalara itadori. Its diet is highly specific to Japanese knotweed and shows good potential for its control. Controlled release trials began in South Wales in 2016.

In Scotland, the Wildlife and Natural Environment (Scotland) Act 2011 came into force in July 2012 that superseded the Wildlife and Countryside Act 1981. This act states that is an offence to spread intentionally or unintentionally Japanese knotweed (or other non-native invasive species).

In Northern Ireland, it has been recorded from Counties Down, Antrim and Londonderry. The earliest record is in 1872.

In the Republic of Ireland, it has been recorded from Howth Head, County Dublin at Doldrum Bay.

United Kingdom lending controversy
In the United Kingdom, Japanese knotweed has received a lot of attention in the press as a result of very restrictive lending policies by banks and other mortgage companies. Several lenders have refused mortgage applications on the basis of the plant being discovered in the garden or neighbouring gardens. The Royal Institution of Chartered Surveyors published a report in 2012 in response to lenders refusing to lend "despite [knotweed] being treatable and rarely causing severe damage to the property".

"There is a real lack of information and understanding of what Japanese knotweed is and the actual damage it can cause. Without actual advice and guidance, surveyors have been unsure of how to assess the risk of Japanese knotweed, which can result in inconsistent reporting of the plant in mortgage valuations. RICS hopes that this advice will provide the industry with the tools it needs to measure the risk effectively, and provide banks with the information they require to identify who and how much to lend to at a time when it is essential to keep the housing market moving."

In response to this guidance, several lenders have relaxed their criteria in relation to discovery of the plant. As recently as 2012, the policy at the Woolwich (part of Barclays plc) was "if Japanese knotweed is found on or near the property then a case will be declined due to the invasive nature of the plant." Their criteria have since been relaxed to a category-based system depending on whether the plant is discovered on a neighbouring property (categories 1 and 2) or the property itself (categories 3 and 4) incorporating proximity to the property curtilage and the main buildings. Even in a worst-case scenario (category 4), where the plant is "within 7 metres (23 feet) of the main building, habitable spaces, conservatory and/or garage and any permanent outbuilding, either within the curtilage of the property or on neighbouring land; and/or is causing serious damage to permanent outbuildings, associated structures, drains, paths, boundary walls and fences" Woolwich lending criteria now specify that this property may be acceptable if "remedial treatment by a Property Care Association (PCA) registered firm has been satisfactorily completed. Treatment must be covered by a minimum 10-year insurance-backed guarantee, which is property specific and transferable to subsequent owners and any mortgagee in possession." Santander have relaxed their attitude in a similar fashion. In 2022 the Royal Institution of Chartered Surveyors produced updated guidance for assessing knotweed. Since the 2012 RICS report much more information on the risks from Japanese knotweed have been gained. One important change is that the distance of a plant from a property to be considered a problem has been reduced to 3 metres (10 feet).

Property Care Association chief executive Steve Hodgson, whose trade body has set up a task force to deal with the issue, said: "Japanese knotweed is not 'house cancer' and could be dealt with in the same way qualified contractors dealt with faulty wiring or damp."

United States
The weed can be found in 42 of the 50 United States.

Canada
According to Gail Wallin, executive director of the Invasive Species Council of B.C., and co-chair of the Canadian Council on Invasive Species, by 2015 it was found in all provinces in Canada except Manitoba and Saskatchewan. In Vancouver plants went under "four lanes of highway and have popped up on the other side." At Mission Point Park in Davis Bay, British Columbia, municipal crews attempted to eradicate it by digging out the plant to a depth of about three metres (10 feet) with an excavator. It grew back twice as large the next year. To avoid an epidemic as in the United Kingdom, some provinces in Canada are pushing for relaxation of provincial limits on the use of herbicides close to waterways so knotweed can be aggressively managed with strong chemicals. In spite of its status as an invasive species it is still sometimes sold or swapped in Canada as an edible "false bamboo". Bohemian knotweed, a hybrid between Japanese and giant knotweed that produces huge quantities of viable seeds, now accounts for about 80 per cent of knotweed infestations in British Columbia.

Common names
Common names for Japanese knotweed include fleeceflower, Himalayan fleece vine, billyweed, monkeyweed, monkey fungus, elephant ears, pea shooters, donkey rhubarb, American bamboo, and Mexican bamboo, among many others, depending on country and location. In Japanese, the name is itadori (虎杖, イタドリ), with the kanji rendering from the Chinese meaning "tiger staff".

title: Reynoutria japonica


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English mythology

English mythology is the collection of myths that have emerged throughout the history of England, sometimes being elaborated upon by successive generations, and at other times being rejected and replaced by other explanatory narratives. These narratives consist of folk traditions developed in England after the Norman Conquest, integrated with traditions from Anglo-Saxon mythology, Christian mythology, and Celtic mythology. Elements of the Matter of Britain, Welsh mythology and Cornish mythology which relate directly to England are included, such as the foundation myth of Brutus of Troy and the Arthurian legends, but these are combined with narratives from the Matter of England and traditions from English folklore.

Notable figures and legends

 * Alfred the Great (849–899): In 878, burnt the cakes in Athelney, Somerset before defeating the Great Heathen Army at the Battle of Edington.
 * Angul (13th century): Legendary founder and king of the Angles.
 * King Arthur (late 5th and early 6th centuries A.D.): Legendary leader who, according to medieval histories and romances, led the Knights of the Round Table in the defence of Britain against Saxon invaders. A central figure in the legends making up the Matter of Britain. (see also: Welsh, Cornish, and Breton mythologies)
 * Athelston (mid- or late 14th century): Anonymous Middle English verse romance, often classified as a Matter of England text. Its themes of kingship, justice and the rule of law relate to the politics of Richard II's reign.
 * Beowulf (dates to between the 8th and the early 11th centuries): Epic poem in Old English. The original manuscript has no title, but the story it tells has become known by the name of its protagonist. Beowulf may be the oldest surviving long poem in Old English and is commonly cited as one of the most important works of Anglo-Saxon literature.
 * Sir Bevis of Hampton (dates to the first half of the 13th century): Legendary English hero; the subject of medieval metrical romances which bear his name.
 * Brutus of Troy, or Brute of Troy (dates to the 9th century: Legendary descendant of the Trojan hero Aeneas, known in medieval British history as the eponymous founder and first king of Britain. Brutus first appears in the Historia Brittonum, but is best known from Geoffrey of Monmouth's Historia Regum Britanniae.
 * Fulk FitzWarin (c. 1160–1258): Subject of the medieval legend Fouke le Fitz Waryn, which relates the story of Fulk's life as an outlaw and his struggle to regain his familial right to Whittington Castle from King John.
 * The Tale of Gamelyn (dates to c. 1350): Romance taking place during the reign of King Edward I, telling the story of Gamelyn and the various obstacles he must overcome in order to retrieve his rightful inheritance from his older brother. Written in a dialect of Middle English and considered part of the Matter of England.
 * Guy of Warwick (dates to the 13th century): Legendary English hero of Romance popular in England and France from the 13th to 17th centuries; considered to be part of the Matter of England.
 * Havelok the Dane, or Lay of Havelok the Dane (between 1280 and 1290): Middle English Romance considered to be part of the Matter of England; the story derives from two earlier Anglo-Norman texts.
 * Hengist and Horsa (5th century): Legendary brothers said to have led the Angles, Saxons and Jutes in their invasion of Britain in the 5th century; Horsa was killed fighting the Britons, but Hengist successfully conquered Kent, becoming the forefather of its Jutish kings. A figure named Hengest appears in the Finnesburg Fragment and in Beowulf.
 * King Horn (dates to the middle of the 13th century): Chivalric romance in Middle English; considered part of the Matter of England. Believed to be the oldest extant romance in Middle English.
 * Lady Godiva (dates to at least the 13th century): English noblewoman who, according to legend, rode naked – covered only in her long hair – through the streets of Coventry to gain a remission of the oppressive taxation that her husband imposed on his tenants. The term "Peeping Tom" originates from later versions of this legend, in which a man named Thomas watched her ride and was struck blind or dead.
 * Robin Hood (dates to the 1370s): Heroic outlaw of English folklore who, according to legend, was a highly skilled archer and swordsman. Traditionally depicted dressed in Lincoln green, he is said to rob from the rich and give to the poor. Alongside his band of Merry Men in Sherwood Forest and against the Sheriff of Nottingham, he became a popular folk figure in the Late Middle Ages, and continues to be represented in literature, film and television.
 * Sceafa (dates, arguably, to the 6th century): Ancient Lombardic king in English legend. The story has Sceafa appearing mysteriously as a child, coming out of the sea in an empty skiff. The name has historically been modernized Shava.
 * Waltheof of Melrose (c. 1095 – 1159): 12th century English abbot and saint; born to the English nobility, Waltheof is noted for his severe, self-imposed austerities and kindness to the poor.
 * Wayland the Smith (dates to the 8th century): Legendary master blacksmith who appears in Deor, Waldere, and Beowulf; the legend is depicted on the Franks Casket.

Legacy of English mythology in English literature

 * Arthurian tales: see King Arthur.
 * The Tales of Robin Hood and his Merry Men: see Robin Hood.
 * The works of C.S. Lewis (1898–1963).
 * The works of William Shakespeare (1564–1616).
 * The works of J.R.R. Tolkien (1892–1973), whose legendarium has been called a mythology for England.

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

title: English mythology


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Lyonesse

Lyonesse (/liːɒˈnɛs/ lee-uh-NESS) is a kingdom which, according to legend, consisted of a long strand of land stretching from Land's End at the southwestern tip of Cornwall, England, to what is now the Isles of Scilly in the Celtic Sea portion of the Atlantic Ocean. It was considered lost after being swallowed by the ocean in a single night. The people of Lyonesse were said to live in fair towns, with over 140 churches, and work in fertile, low-lying plains. Lyonesse's most significant attraction was a castle-like cathedral that was presumably built on top of what is now the Seven Stones Reef between Land's End and the Isles of Scilly, some 18 mi west of Land's End and 8 mi north-east of the Isles of Scilly. It is sometimes spelled Lionesse.

Lyonesse is mentioned in Arthurian legend, specifically in the tragic love-and-loss story of Tristan and Iseult. It was the home of the hero Tristan (one of the Knights of the Round Table), whose father Meliodas was king of Lyonesse. After the death of Meliodas, Tristan became the heir of Lyonesse, but he was never to take up his inheritance because the land sank beneath the sea while he was away at his uncle King Mark's court in Cornwall. In later traditions, Lyonesse is said to have sunk beneath the waves in a single night, but stories differ as to whether this catastrophic event occurred on 11 November 1099, or 10 years earlier. According to one legend, the people of Lyonesse had committed a crime so terrible that God took his revenge against them and their kingdom. The exact nature of the crime is never specified, but the legend tells of a horrific storm that occurred over the course of a single night, resulting in an enormous wave that swallowed the kingdom.

The sole survivor
Local Cornwall village tourism guides offer stories of a man who escaped the storm and a subsequent wave while riding a white horse. Apparently, the horse lost one of its shoes during the escape. The rider's name is thought to be Trevelyan (or Trevilian). The rider had been out hunting during the day and had fallen asleep under a tree. Trevelyan was awoken by a horrible noise and raced across the land to higher ground. This story is linked to local Cornish families who have used the image of three horseshoes as part of their family crest for generations. One family in particular goes by the name Vyvyan, and is one of Cornwall's oldest families; they also have a crest of a white horse and claim to be descendants of the sole survivor, Trevelyan. The Vyvyan family claims that Trevelyan was the last governor of the lost kingdom before Lyonesse was swallowed by the ocean.

Today, many myths and legends continue to arise about Lyonesse without physical evidence. Included among these legends are tales of local fishermen who claim that on calm days, one can still hear the bells of the many churches softly ringing in the seas off the west Cornish coast. Local fishermen also claim that they have caught glass, forks, and wood in their fishing nets.

The Lyonesse Project
A 2009–13 joint study titled The Lyonesse Project: A Study of the Coastal and Marine Environment of the Isles of Scilly was commissioned by English Heritage and carried out by the Historic Environment Projects, Cornwall Council, with a team of academics, local experts, and enthusiasts "to reconstruct the evolution of the physical environment of the Isles of Scilly during the Holocene, the progressive occupation of this changing coastal landscape by early peoples, and their response to marine inundation and changing marine resource availability." The project found that while much of the story of Lyonesse can be "dismissed as fantasy", an overflow of legends and memories of submergences is common throughout the northwestern portion of Europe. It concluded that the Isles of Scilly were once a single large island, which separated into smaller islands due to the rapid sea-level rise. Stone walls have been located under the water in the vicinity of the Isles of Scilly, which support the findings that sea level rises impacted the towns of the area, although whether they are evidence of buildings or the remains of medieval fish traps remains unclear.

Lyonesse in Arthurian legend
In medieval Arthurian legend, no references are made to the sinking of Lyonesse, because the name originally referred to a still-existing place. Lyonesse is an English alteration of French Léoneis or Léonois (earlier Loönois), a development of Lodonesia, the Latin name for Lothian in Scotland. Continental writers of Arthurian romances were often puzzled by the internal geography of Great Britain; thus it is that the author of the French Prose Tristan appears to place Léonois beside Cornwall.

In English adaptations of the French tales, Léonois, now "Lyonesse", becomes a kingdom wholly distinct from Lothian, and closely associated with the Cornish region, though its exact geographical location remained unspecified. The name was not attached to Cornish legends of lost coastal lands until the reign of Elizabeth I of England. However, the legendary lost land between Land's End and Scilly has a distinct Cornish name: Lethowsow. This derives from the Cornish name for the Seven Stones Reef, on the reputed site of the lost land's capital and the site of the notorious wreck of the SS Torrey Canyon. The name means 'the milky ones', from the constant white water surrounding the reef.

Alfred, Lord Tennyson's Arthurian epic Idylls of the King describes Lyonesse as the site of the final battle between King Arthur and Mordred (King Arthur's nephew and illegitimate son). One passage in particular references legends of Lyonesse and its rise from (and subsequent return to) the ocean:

Then rose the King and moved his host by night And ever pushed Sir Mordred, league by league, Back to the sunset bound of Lyonesse— A land of old upheaven from the abyss By fire, to sink into the abyss again; Where fragments of forgotten peoples dwelt, And the long mountains ended in a coast Of ever-shifting sand, and far away The phantom circle of a moaning sea.

Analogues in Celtic mythology
The legend of a sunken kingdom appears in Cornish, Breton and Welsh mythologies. In Christian times, it came to be viewed as a sort of Cornish Sodom and Gomorrah, an example of divine wrath provoked by unvirtuous living. A Breton parallel is found in the tale of the Cité d'Ys or Ker Ys, similarly drowned as a result of its debauchery, with a single virtuous survivor, King Gradlon, escaping on a horse. According to Welsh legend, the kingdom of Cantre'r Gwaelod in Cardigan Bay was drowned due to the drunkard negligence of its prince, Seithenyn, who allowed the sea to sweep through the floodgates.

The tale of Lyonesse is sometimes suggested to represent an extraordinary survival of folk memory of the flooding of the Isles of Scilly and Mount's Bay near Penzance when the sea levels rose during the Bronze Age. For example, the Cornish name of St Michael's Mount is Karrek Loos y'n Koos – literally "the grey rock in the wood", suggesting that the bay was once a forest. According to local tourism guides in the region, Lyonesse was once connected to the west of Cornwall and is firmly rooted in Cornwall's traditions and mythology. Cornish people around Penzance still get occasional glimpses at extreme low water of a sunken forest in Mount's Bay, where petrified tree stumps become visible adjacent to the Celtic Sea. John of Worcester, a famous English monk and chronicler, wrote in 1099 that St Michael's Mount (now an island in Mount's Bay) was five or six miles from the sea, enclosed in a thick wood. The importance of the maintenance of this memory can be seen in that it came to be associated with the legendary Brython hero Arthur, although the date of its inundation is actually c. 2500 BC.

In fiction

 * Dawn in Lyonesse is a 1938 short novel by Mary Ellen Chase.
 * The Lyonesse Trilogy is a group of three novels by Jack Vance.
 * Lyonesse: The Well Between the Worlds (2009) and Lyonesse: Dark Solstice (2010) are two children's books by Sam Llewellyn.
 * The manga and anime series The Seven Deadly Sins is set in the kingdom of Liones, which is placed in the north of Britannia (i.e., Lothian instead of Cornwall) on in-universe maps.
 * In the 1995 film First Knight, before her marriage to King Arthur, Guinevere rules as "Lady of Lyonesse".

In poetry

 * Tristram of Lyonesse (1882) is an epic poem by Algernon Charles Swinburne.
 * When I Set out for Lyonnesse (1914) is by Thomas Hardy. An edition published in 1932 adds the year 1870 to the title, a reference to Hardy's trip to St Juliot, where he met his first wife Emma Gifford. The poem said Lyonnesse is "a hundred miles away"; the straight-line distance from St Juliot to Dorchester is 97 miles.
 * Sunk Lyonesse (1922), by Walter de la Mare
 * Lyonnesse (1962), by Sylvia Plath
 * Lyonnesse (2021), by Penelope Shuttle

In music

 * "Lyonesse", a song by Cornish folk composer Richard Gendall, appears as the title track of the 1982 album by Brenda Wootton.
 * "When I Set out for Lyonnesse" is a setting of Hardy's poem by English composer Gerald Finzi in his 1936 song cycle Earth and Air and Rain
 * "The Bells of Lyonesse", a song by German progressive metal band Subsignal, appears on their 2018 album La Muerta.

In transport

 * SS Lyonesse is a steam ferry of the West Cornwall Steam Ship Company.
 * Lyonesse: Great Western Railway Bulldog class steam locomotive no. 3361
 * Lyonnesse: Southern Railway King Arthur class steam locomotive no. 743
 * Lyonnesse: British Railways standard class 5 steam locomotive no. 73113.

title: Lyonesse


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Dragon Book

The Dragon Book may refer to:
 * Principles of Compiler Design, a book by Alfred V. Aho, and Jeffrey D. Ullman
 * Compilers: Principles, Techniques, and Tools, a book by Alfred V. Aho, Monica S. Lam, Ravi Sethi, and Jeffrey D. Ullman

title: Dragon Book


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Tajiks

Tajiks (Тоҷик) are a Persian-speaking Iranian ethnic group native to Central Asia, living primarily in Afghanistan, Tajikistan, and Uzbekistan. Tajiks are the largest ethnicity in Tajikistan, and the second-largest in Afghanistan and Uzbekistan. They speak varieties of Persian, a Western Iranian language. In Tajikistan, since the 1939 Soviet census, its small Pamiri and Yaghnobi ethnic groups are included as Tajiks. In China, the term is used to refer to its Pamiri ethnic groups, the Tajiks of Xinjiang, who speak the Eastern Iranian Pamiri languages. In Afghanistan, the Pamiris are counted as a separate ethnic group.

As a self-designation, the literary New Persian term Tajik, which originally had some previous pejorative usage as a label for eastern Persians or Iranians, has become acceptable during the last several decades, particularly as a result of Soviet administration in Central Asia. Alternative names for the Tajiks are Fārsīwān (Persian-speaker), and Dīhgān (cf. Деҳқон) which translates to "farmer or settled villager", in a wider sense "settled" in contrast to "nomadic" and was later used to describe a class of land-owning magnates as "Persian of noble blood" in contrast to Arabs, Turks and Romans during the Sassanid and early Islamic period.

History

The Tajiks are an Iranian people, speaking a variety of Persian, concentrated in the Oxus Basin, the Farḡāna valley (Tajikistan and parts of Uzbekistan) and on both banks of the upper Oxus, i.e., the Pamir Mountains (Mountain Badaḵšān, in Tajikistan) and northeastern Afghanistan (Badaḵšān). Historically, the ancient Tajiks were chiefly agriculturalists before the Arab Conquest of Iran. While agriculture remained a stronghold, the Islamization of Iran also resulted in the rapid urbanization of historical Khorasan and Transoxiana that lasted until the devastating Mongolian invasion. Several surviving ancient urban centers of the Tajik people include Samarkand, Bukhara, Khujand, and Termez.

Contemporary Tajiks are the descendants of ancient Eastern Iranian inhabitants of Central Asia, in particular, the Sogdians and the Bactrians. Possibly are descendants from other groups, with an admixture of Western Iranian Persians and non-Iranian peoples. According to Richard Nelson Frye, a leading historian of Iranian and Central Asian history, the Persian migration to Central Asia may be considered the beginning of the modern Tajik nation, and ethnic Persians, along with some elements of East-Iranian Bactrians and Sogdians, as the main ancestors of modern Tajiks. In later works, Frye expands on the complexity of the historical origins of the Tajiks. In a 1996 publication, Frye explains that many "factors must be taken into account in explaining the evolution of the peoples whose remnants are the Tajiks in Central Asia" and that "the peoples of Central Asia, whether Iranian or Turkic speaking, have one culture, one religion, one set of social values and traditions with only language separating them."

Regarding Tajiks, the Encyclopædia Britannica states:"The Tajiks are the direct descendants of the Iranian peoples whose continuous presence in Central Asia and northern Afghanistan is attested from the middle of the 1st millennium BC. The ancestors of the Tajiks constituted the core of the ancient population of Khwārezm (Khorezm) and Bactria, which formed part of Transoxania (Sogdiana). Over the course of time, the eastern Iranian dialect that was used by the ancient Tajiks eventually gave way to Farsi, a western dialect spoken in Iran and Afghanistan."

The geographical division between the eastern and western Iranians is often considered historically and currently to be the desert Dasht-e Kavir, situated in the center of the Iranian plateau.

Modern history
During the Soviet–Afghan War, the Tajik-dominated Jamiat-e Islami founded by Burhanuddin Rabbani resisted the Soviet Army and the communist Afghan government. Tajik commander, Ahmad Shah Massoud, successfully repelled nine Soviet campaigns from taking Panjshir Valley and earned the nickname "Lion of Panjshir" (شیر پنجشیر).

Etymology
According to John Perry (Encyclopaedia Iranica): "The most plausible and generally accepted origin of the word is Middle Persian tāzīk 'Arab' (cf. New Persian tāzi), or an Iranian (Sogdian or Parthian) cognate word. The Muslim armies that invaded Transoxiana early in the eighth century, conquering the Sogdian principalities and clashing with the Qarluq Turks (see Bregel, Atlas, Maps 8–10) consisted not only of Arabs, but also of Persian converts from Fārs and the central Zagros region (Bartol'd [Barthold], 'Tadžiki,' pp. 455–57). Hence the Turks of Central Asia adopted a variant of the Iranian word, täžik, to designate their Muslim adversaries in general. For example, the rulers of the south Indian Chalukya dynasty and Rashtrakuta dynasty also referred to the Arabs as 'Tajika' in the 8th and 9th century. By the eleventh century (Yusof Ḵāṣṣ-ḥājeb, Qutadḡu bilig, lines 280, 282, 3265), the Qarakhanid Turks applied this term more specifically to the Persian Muslims in the Oxus basin and Khorasan, who were variously the Turks' rivals, models, overlords (under the Samanid Dynasty), and subjects (from Ghaznavid times on). Persian writers of the Ghaznavid, Seljuq and Atābak periods (ca. 1000–1260) adopted the term and extended its use to cover Persians in the rest of Greater Iran, now under Turkish rule, as early as the poet ʿOnṣori, ca. 1025 (Dabirsiāqi, pp. 3377, 3408). Iranians soon accepted it as an ethnonym, as is shown by a Persian court official's referring to mā tāzikān 'we Tajiks' (Bayhaqi, ed. Fayyāz, p. 594). The distinction between Turk and Tajik became stereotyped to express the symbiosis and rivalry of the (ideally) nomadic military executive and the urban civil bureaucracy (Niẓām al-Molk: tāzik, pp. 146, 178–79; Fragner, 'Tādjīk. 2' in EI2 10, p. 63)."

The word also occurs in the Tonyukuk inscriptions as tözik, used for a local Arab tribe in the Tashkent area. These Arabs were said to be from the Taz tribe, which is still found in Yemen. In the 7th-century, the Taz began to Islamize Transoxiana.

According to the Encyclopaedia of Islam, however, the oldest known usage of the word Tajik as a reference to Persians in Persian literature can be found in the writings of the Persian poet Jalal ad-Din Rumi. The 15th-century Turkic-speaking poet Mīr Alī Šer Navā'ī also used Tajik as a reference to Persians.

Location
The Tajiks are the principal ethnic group in most of Tajikistan, as well as in northern and western Afghanistan, though there are more Tajiks in Afghanistan than in Tajikistan. Tajiks are a substantial minority in Uzbekistan, as well as in overseas communities. Historically, the ancestors of the Tajiks lived in a larger territory in Central Asia than now.

Tajikistan
Tajiks make up around 84.3% of the population of Tajikistan. This number includes speakers of the Pamiri languages, including Wakhi and Shughni, and the Yaghnobi people who in the past were considered by the government of the Soviet Union nationalities separate from the Tajiks. In the 1926 and 1937 Soviet censuses, the Yaghnobis and Pamiri language speakers were counted as separate nationalities. After 1937, these groups were required to register as Tajiks.

Afghanistan
In Afghanistan, a "Tajik", is typically defined as any primarily Dari-speaking Sunni Muslim who refer to themselves by the region, province, city, town, or village that they are from; such as Badakhshi, Baghlani, Mazari, Panjsheri, Kabuli, Herati, Kohistani, etc. Although in the past, some non-Pashto speaking tribes were identified as Tajik, for example, the Furmuli. By this definition, according to the World Factbook, Tajiks make up about 25–27% of Afghanistan's population, but according to other sources, they form 37–39% of the population. Other sources however, for example the Encyclopædia Britannica, state that they constitute about 12–20% of the population, which is mostly excluding Persianized ethnic groups like some Pashtuns, Uzbeks, Qizilbash, Aimaqs etc. who, especially in large urban areas like Kabul or Herat, assimiliated into the respective local culture. Tajiks (or Farsiwans respectively) are predominant in four of the largest cities in Afghanistan (Kabul, Mazar-e Sharif, Herat, and Ghazni) and make up the qualified majority in the northern and western provinces of Badakhshan and Panjshir while making up significant portions of the population in Balkh, Takhar, Kabul, Parwan, Kapisa, Baghlan, Badghis and Herat. Despite not being Tajik, the westernmost Indo-Aryan Pashayi people of eastern Afghanistan have deliberately been listed as Tajik by census takers and government agents. This is a result of the census takers being Tajik themselves, wanting to increase their own numbers for “consequent benefits”. Although, Pashayi-speaking Nizari Isma’ilis refer to themselves as Tajik.

Uzbekistan

In Uzbekistan, the Tajiks are the largest part of the population of the ancient cities of Bukhara and Samarkand, and are found in large numbers in the Surxondaryo Region in the south and along Uzbekistan's eastern border with Tajikistan. According to official statistics (2000), Surxondaryo Region accounts for 20.4% of all Tajiks in Uzbekistan, with another 34.3% in Samarqand and Bukhara regions.

Official statistics in Uzbekistan state that the Tajik community accounts for 5% of the nation's population. However, these numbers do not include ethnic Tajiks who, for a variety of reasons, choose to identify themselves as Uzbeks in population census forms. During the Soviet "Uzbekization" supervised by Sharof Rashidov, the head of the Uzbek Communist Party, Tajiks had to choose either stay in Uzbekistan and get registered as Uzbek in their passports or leave the republic for Tajikistan, which is mountainous and less agricultural. It is only in the last population census (1989) that the nationality could be reported not according to the passport, but freely declared based on the respondent's ethnic self-identification. This had the effect of increasing the Tajik population in Uzbekistan from 3.9% in 1979 to 4.7% in 1989. Some scholars estimate that Tajiks may make up 35% of Uzbekistan's population, and believe that just like Afghanistan, there are more Tajiks in Uzbekistan than in Tajikistan.

China
Chinese Tajiks or Mountain Tajiks in China (Sarikoli:, Tujik; ), including Sarikolis (majority) and Wakhis (minority) in China, are the Pamiri ethnic group that lives in the Xinjiang Uyghur Autonomous Region in Northwestern China. They are one of the 56 nationalities officially recognized by the government of the People's Republic of China.

Kazakhstan
According to the 1999 population census, there were 26,000 Tajiks in Kazakhstan (0.17% of the total population), about the same number as in the 1989 census.

Kyrgyzstan
According to official statistics, there were about 47,500 Tajiks in Kyrgyzstan in 2007 (0.9% of the total population), up from 42,600 in the 1999 census and 33,500 in the 1989 census.

Turkmenistan
According to the last Soviet census in 1989, there were 3,149 Tajiks in Turkmenistan, or less than 0.1% of the total population of 3.5 million at that time. The first population census of independent Turkmenistan conducted in 1995 showed 3,103 Tajiks in a population of 4.4 million (0.07%), most of them (1,922) concentrated in the eastern provinces of Lebap and Mary adjoining the borders with Afghanistan and Uzbekistan.

Russia
The population of Tajiks in Russia was about 350,236 according to the 2021 census, up from 38,000 in the last Soviet census of 1989. Most Tajiks came to Russia after the dissolution of the Soviet Union, often as guest workers in places like Moscow and Saint Petersburg or federal subjects near the Kazakhstan border. There are currently estimated to be over one million Tajik guest workers living in Russia, with their remittances accounting for as much as half of Tajikistan's economy.

Pakistan
There are an estimated 220,000 Tajiks in Pakistan as of 2012, mainly refugees from Afghanistan. During the 1990s, as a result of the Tajikistan Civil War, between 700 and 1,200 Tajiks arrived in Pakistan, mainly as students, the children of Tajik refugees in Afghanistan. In 2002, around 300 requested to return home and were repatriated back to Tajikistan with the help of the IOM, UNHCR and the two countries' authorities.

United States
80,414 Tajiks live in the United States.

Genetics
A 2014 study of the maternal haplogroups of Tajiks from Tajikistan revealed substantial admixture of West Eurasian and East Eurasian lineages, and also the presence of South Asian and North African lineages, as well. Another study reports that "the Tajik mtDNA pool gene pool harbors nearly equal proportions of eastern Eurasian and western Eurasian haplotypes."

West Eurasian maternal lineages included haplogroups H, J, K, T, I, W and U. East Eurasian lineages included haplogroups M, C, Z, D, G, A, Y and B. South Asian lineages detected in this study included haplogroups M and R. One lineage in the Tajik sample was assigned to the North African maternal haplogroup X2j.

The dominant paternal haplogroup among modern Tajiks is the Haplogroup R1a Y-DNA. ~45% of Tajik men share R1a (M17), ~18% J (M172), ~8% R2 (M124), and ~8% C (M130 & M48). Tajiks of Panjikent score 68% R1a, Tajiks of Khojant score 64% R1a. The high frequency of haplogroup R1a in the Tajiks probably reflects a strong founder effect. According to another genetic test, 63% of Tajik male samples from Tajikistan carry R1a. An autosomal DNA study by Guarino-Vignon et al. (2022), suggested that modern Tajiks show genetic continuity with ancient samples from Tajikistan and Turkmenistan. The genetic ancestry of Tajiks consists largely of a West-Eurasian component (~74%), an East Asian-related component (~18%), and a South Asian component samplified by Great Andamanese (~8%). According to the authors, the South Asian (Great Andamanese) affinity of Tajiks was previously unreported, although evidence for the presence of a deep South Asian ancestry was already found previously in other Central Asian samples (e.g. among modern Turkmens and historical Bactria–Margiana Archaeological Complex samples). Both historical and more recent geneflow (~1500 years ago) shaped the genetic makeup of Southern Central Asian populations, such as the Tajiks. A follow-up study by Dai et al. (2022) estimated that the Tajiks derive between 11.6 and 18.6% ancestry from admixture with from an East-Eurasian steppe source represented by the Xiongnu, with the remainder of their ancestry being derived from Western Steppe Herders and BMAC components, as well as a small contribution from the early population associated with the Tarim mummies. The authors concluded that Tajiks "present patterns of genetic continuity of Central Asians since the Bronze Age".

Language
The language of the Tajiks is an eastern dialect of Persian, called Dari (derived from Darbārī, "[of/from the] royal courts", in the sense of "courtly language"), or also Parsi-e Darbari. In Tajikistan, where Cyrillic script is used, it is called the Tajiki language. In Afghanistan, unlike in Tajikistan, Tajiks continue to use the Perso-Arabic script, as well as in Iran. When the Soviet Union introduced the Latin script in 1928, and later the Cyrillic script, the Persian dialect of Tajikistan came to be disassociated from the Tajik language. Many Tajik authors have lamented this artificial separation of the Tajik language from its Iranian heritage. One Tajik poem relates:

Once you said 'you are Iranian', then you said, 'you are Tajik'

May he die separated from his roots, he who separated us.

Since the 19th century, Tajiki has been strongly influenced by the Russian language and has incorporated many Russian language loan words. It has also adopted fewer Arabic loan words than Iranian Persian while retaining vocabulary that has fallen out of use in the latter language.

Many Tajiks can read, speak or write in Russian, however the prestige and importance of Russian has declined since the fall of the Soviet Union and the exodus of Russians from Central Asia. Nevertheless, Russian fluency is still considered an vital skill for business and education.

The dialects of modern Persian spoken throughout Greater Iran have a common origin. This is due to the fact that one of Greater Iran's historical cultural capitals, called Greater Khorasan, which included parts of modern Central Asia and much of Afghanistan and constitutes as the Tajik's ancestral homeland, played a key role in the development and propagation of Persian language and culture throughout much of Greater Iran after the Muslim conquest. Furthermore, early manuscripts of the historical Persian spoken in Mashhad during the development of Middle to New Persian show that their origins came from Sistan, in present-day Afghanistan.

Religion
Various scholars have recorded the Zoroastrian, Hindu, and Buddhist pre-Islamic heritage of the Tajik people. Early temples for fire worship have been found in Balkh and Bactria and excavations in present-day Tajikistan and Uzbekistan show remnants of Zoroastrian fire temples.

Today, however, the great majority of Tajiks follow Sunni Islam, although small Twelver and Ismaili Shia minorities also exist in scattered pockets. Areas with large numbers of Shias include Herat, Badakhshan provinces in Afghanistan, the Gorno-Badakhshan Autonomous Province in Tajikistan, and Tashkurgan Tajik Autonomous County in China. Some of the famous Islamic scholars were from either modern or historical East-Iranian regions lying in Afghanistan, Tajikistan, Uzbekistan and Turkmenistan and therefore can arguably be viewed as Tajiks. They include Abu Hanifa, Imam Bukhari, Tirmidhi, Abu Dawood, Nasir Khusraw and many others.

According to a 2009 U.S. State Department release, the population of Tajikistan is 98% Muslim, (approximately 85% Sunni and 5% Shia). In Afghanistan, the great number of Tajiks adhere to Sunni Islam. A small number of Tajiks may follow Twelver Shia Islam; the Farsiwan are one such group. The community of Bukharian Jews in Central Asia speak a dialect of Persian. The Bukharian Jewish community in Uzbekistan is the largest remaining community of Central Asian Jews and resides primarily in Bukhara and Samarkand, while the Bukharaian Jews of Tajikistan live in Dushanbe and number only a few hundred. From the 1970s to the 1990s the majority of these Tajik-speaking Jews emigrated to the United States and to Israel in accordance with Aliyah. Recently, the Protestant community of Tajiks descent has experienced significant growth, a 2015 study estimates some 2,600 Muslim Tajik converted to Christianity.

Tajikistan marked 2009 as the year to commemorate the Tajik Sunni Muslim jurist Abu Hanifa, whose ancestry hailed from Parwan Province of Afghanistan, as the nation hosted an international symposium that drew scientific and religious leaders. The construction of one of the largest mosques in the world, funded by Qatar, was announced in October 2009. The mosque is planned to be built in Dushanbe and construction is said to be completed by 2014.

Cultural revival
The collapse of the Soviet Union and the Civil War in Afghanistan both gave rise to a resurgence in Tajik nationalism across the region, including a trial to revert to the Perso-Arabic script in Tajikistan. Furthermore, Tajikistan in particular has been a focal point for this movement, and the government there has made a conscious effort to revive the legacy of the Samanid empire, the first Tajik-dominated state in the region after the Arab advance. For instance, the President of Tajikistan, Emomalii Rahmon, dropped the Russian suffix "-ov" from his surname and directed others to adopt Tajik names when registering births. According to a government announcement in October 2009, approximately 4,000 Tajik nationals have dropped "ov" and "ev" from their surnames since the start of the year.

In September 2009, the Islamic Renaissance Party of Tajikistan proposed a draft law to have the nation's language referred to as "Tajiki-Farsi" rather than "Tajik." The proposal drew criticism from Russian media since the bill sought to remove the Russian language as Tajikistan's inter-ethnic lingua franca. In 1989, the original name of the language (Farsi) had been added to its official name in brackets, though Rahmon's government renamed the language to simply "Tajiki" in 1994. On 6 October 2009, Tajikistan adopted the law that removes Russian as the lingua franca and mandated Tajik as the language to be used in official documents and education, with an exception for members Tajikistan's ethnic minority groups, who would be permitted to receive an education in the language of their choosing.

title: Tajiks


text:
Luge

A luge is a small one- or two-person sled on which one sleds supine (face-up) and feet-first. A luger begins seated, propelling themselves initially from handles on either side of the start ramp, then steers by using the calf muscles to flex the sled's runners or by exerting opposite shoulder pressure to the pod. Racing sleds weigh 21 – for singles and 25 – for doubles. Luge is also the name of an Olympic sport that employs that sled and technique.

It is not to be confused with skeleton bob, which is also a single person tray-like sled in the Bobsleigh family, and the name of the sport that uses that sled, but which is designed for a running start, steering by shoulders and feet, and to be laid on face down and head first. While skeleton and bobsleigh are part of one international federation and sport, luge is organised separately by the International Luge Federation, FIL.

Lugers can reach speeds of over 140 km/h (87 mph), and is the fastest of the three 'sliding' sports. Austrian Manuel Pfister reached a top speed of 154 km/h (96 mph) on a track in Whistler, Canada, prior to the 2010 Winter Olympics. Lugers compete against a timer in one of the most precisely timed sports in the world—to one millisecond on artificial tracks.

The first recorded use of the term "luge" dates to 1905 and derives from the Savoy/Swiss dialect of the French word luge, meaning "small coasting sled".

History
The practical use of sleds is ancient and widespread. The first recorded sled races took place in Norway sometime during the 15th century.

The sport of luge, like the skeleton and the bobsleigh, originated in the health-spa town of St Moritz, Switzerland, in the mid-to-late 19th century, through the endeavours of hotel entrepreneur Caspar Badrutt. Badrutt successfully sold the idea of winter resorting, as well as rooms with food, drink, and activities. His more adventurous English guests began adapting delivery boys' sleds for recreation, which led to collisions with pedestrians as they sped down the lanes and alleys of the village.

The first organized meeting of the sport took place in 1883 in Switzerland. In 1913, the Internationale Schlittensportverband or International Sled Sports Federation was founded in Dresden, Germany. This body governed the sport until 1935, when it was incorporated in the Fédération Internationale de Bobsleigh et de Tobogganing (FIBT, International Bobsleigh and Tobogganing Federation). After it had been decided that luge would replace the sport of skeleton at the Olympic Games, the first World Championships in the sport were held in 1955 in Oslo (Norway). In 1957, the Fédération Internationale de Luge de Course (FIL, International Luge Federation) was founded. Luge events were first included in the Olympic Winter Games in 1964.

Americans were slow to adopt the sport of luge. The first luge run in North America was built at Lolo Hot Springs, Montana, in 1965. Although the United States competed in every Olympic luge event from 1964 through 1976, it was not until 1979 that the United States Luge Association was founded. The first artificial American track was completed in that year for use in the 1980 XIII Winter Olympic Games at Lake Placid, New York. Since that time the United States luge program has greatly improved. A second artificial track was constructed near Park City, Utah, for the 2002 XIX Olympic Winter Games at Salt Lake City.

Caitlin Nash and Natalie Corless, both of Canada, became the first all-female team to compete in a Senior World Cup doubles race in luge in 2019.

Artificial tracks

Artificial luge tracks have specially designed and constructed banked curves plus walled-in straights. Most tracks are artificially refrigerated, but artificial tracks without artificial cooling also exist (for example, in St. Moritz). Tracks tend to be very smooth.

The athletes ride in a flat, aerodynamic position on the sled, keeping their heads low to minimize air resistance. They steer the sled mainly with their calves by applying pressure on the runners—right calf to turn left, left calf to turn right. It takes a precise mix of shifting body weight, applying pressure with calves and rolling the shoulders. There are also handles for minor adjustments. A successful luger maintains complete concentration and relaxation on the sled while travelling at high speeds. Fastest times result from following the perfect "line" down the track. Any slight error, such as brushing against the wall, costs time. Track conditions are also important. Softer ice tends to slow speeds, while harder ice tends to lead to faster times. Lugers race at speeds averaging 120 – around high banked curves while experiencing a centripetal acceleration of up to 5g. Men's Singles have their start locations near where the bobsled and skeleton competitors start at most tracks, while both the Doubles and Women's Singles competition have their starthouse located farther down the track. Artificial track luge is the fastest and most agile sledding sport.

Natural track luge

Natural tracks are adapted from existing mountain roads and paths. Artificially banked curves are not permitted. The track's surface should be horizontal. They are naturally iced. Tracks can get rough from the braking and steering action. Athletes use a steering rein, put out their hands and use their legs in order to drive around the tight corners. Braking is often required in front of curves and is accomplished by the use of spikes built on the bottom of the shoes. Tracks have a slope of not more than 15%.

Most of the tracks are situated in Austria and Italy, with others in Germany, Poland, Russia, Slovenia, Switzerland, Croatia, Liechtenstein, France, Turkey, Sweden, Norway, Romania, Slovakia, New Zealand, Canada and the United States.

The Upper Peninsula Luge Club in Negaunee, Michigan, is the only natural luge track in the United States. The over 800 meter (half-mile) track features 10 full corners along its 88 m vertical drop.

Canada has tracks in Camrose, Hinton Luge, Alberta, Calgary and Ontario Luge Club. The track in Naseby, New Zealand is the only one in the southern hemisphere. The track is 360 meters long, and is open to the public through winter.

World championships have been held since 1979 while European championships have been held since 1970. In season 2015/16 FIL started with the Junior Worldcup.

Events
There are five luge disciplines. These are further broken into several age classes - multiple youth and junior classes that cover the range of age 7–20, and general class (ages 21 and older). Older competitors may enjoy the sport in masters (age 30–50), and senior masters (age 51+) classes. In a team relay competition, one man, one woman, and a doubles pair form a team. A touchpad at the bottom of the run is touched by a competitor signaling a teammate at the top of the run to start.
 * Men's singles
 * Men’s doubles
 * Women's singles
 * Women’s doubles (debuts in 2026)
 * Team relay

Rules and procedures for races are very precise:
 * A drawing is held to determine start order for the race. Athletes are assigned a number which is displayed on a bib. For most races, all categories race 2 runs. During the Olympic Games the Men's and Women's singles races are held over 4 runs. Conversely, Men's doubles is 2 runs.  The cumulative time of all runs is used to determine finish order. In all three events, the start order after the first run is determined by the outcome of the previous run, with the last-place slider sliding first, the next-to-last place slider sliding second, and so forth, with the leader of the previous run sliding last.
 * Physical measurements of the sled are taken, and the temperature of the sled's steel blades is checked and may not be more than 5 °C (9 °F) above that of a previously established control temperature. Additionally, for artificial track races, the athlete must first be weighed. This is to determine whether the athlete is entitled to carry extra weight on their body while sliding. Men may use additional weight amounting to 75% of the difference between body weight and a base weight of 90 kg. Women may use additional weight amounting to 50% of the difference between body weight and a base weight of 70 kg. Doubles athletes may use additional weight amounting to 50% of the difference between body weight and a base weight of 90 kg. Additional weight is not allowed if the body weight of the front person and back person together exceeds 180 kg. If one of the partners weighs more than 90 kg, the weight exceeding the 90 kg mark is added to the lighter partner. If there should still be a difference between the partner's weight and the 90 kg mark, the difference can be compensated according to an official weight table. Between runs, athletes are randomly selected for additional weight checks. Before each run, the sled (with the athlete, for artificial track races) is weighed at the start ramp.
 * Once an athlete is on their sled, they are audibly notified that the track is clear. At this point, a tone sounds and the athlete has thirty seconds to begin their run. A run becomes official when an athlete and their sled, in contact with one another, crosses the finish line. If an athlete and sled are not within contact of one another, the athlete is disqualified from further competition. Disqualifications may also take place for any violation of rules and regulations. Certain disqualifications may be appealed.

Training
The sport of luge requires an athlete to balance mental and physical fitness. Physically, a luger must have strong neck, upper body, abdominal, and thigh muscles. Athletes also use wind tunnels to train. Strength training is essential to withstand the extreme G-forces of tight turns at high speeds. Since lugers have very little protection other than a visor and helmet, they must be able to endure the physical pounding administered by the track when mistakes are made.

Risks
As with many extreme sports, luging has risks. Though most injuries involve bumps, bruises, broken bones and concussions, fatalities do occasionally occur. Georgian luger Nodar Kumaritashvili suffered a fatal crash during his final practice run for the 2010 Winter Olympics on the Whistler Sliding Centre in Whistler, British Columbia, Canada. Hours later, the International Luge Federation concluded that the accident was caused by a steering error and not a track error; nevertheless, changes to the track were made before the re-opening. Kumaritashvili was the fourth athlete to die while in preparation for a Winter Olympics competition, following speed skier Nicolas Bochatay, aged 27, who died while preparing for the Albertville 1992 games; and British luger Kazimierz Kay-Skrzypecki and skier Ross Milne, aged 19, who both died in the run-up to the Innsbruck 1964 games.

Governing body
The sport of luge is governed by the Fédération International de Luge de Course (FIL, International Luge Federation). The FIL is based in Salzburg, Austria, and includes 53 member nations. It has traditionally had a dominant number of German-speaking representatives.

The following persons have been president of the FIL:
 * Bert Isatitsch, Austria (1957–1994)
 * Josef Fendt, Germany (1994–2020)
 * Einars Fogelis, Latvia (2020–present)

Men's singles
up to: 2022

Doubles
up to: 2022

Women's singles
up to: 2022

Team relay
up to: 2022

Total Olympic Medals
up to: 2022

 * including East Germany and West Germany
 * including Soviet Union and Russian Olympic Committee

title: Luge