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๐Ÿ”— Ligne Claire

๐Ÿ”— Comics ๐Ÿ”— Belgium

Ligne claire (French for "clear line", pronouncedย [liษฒ klษ›ส]; Dutch: klare lijn) is a style of drawing created and pioneered by Hergรฉ, the Belgian creator of The Adventures of Tintin. It uses clear strong lines sometimes of varied width and no hatching, while contrast is downplayed as well. Cast shadows are often illuminated, and the style often features strong colours and a combination of cartoonish characters against a realistic background. All these elements together can result in giving comics drawn this way a flat aspect. The name was coined by Joost Swarte in 1977.

Discussed on

๐Ÿ”— Terfenol-D

๐Ÿ”— Military history ๐Ÿ”— Military history/Military science, technology, and theory ๐Ÿ”— Chemistry

Terfenol-D, an alloy of the formula TbxDy1โˆ’xFe2 (xย โ‰ˆย 0.3), is a magnetostrictive material. It was initially developed in the 1970s by the Naval Ordnance Laboratory in United States. The technology for manufacturing the material efficiently was developed in the 1980s at Ames Laboratory under a U.S. Navy-funded program. It is named after terbium, iron (Fe), Naval Ordnance Laboratory (NOL), and the D comes from dysprosium.

Discussed on

๐Ÿ”— Movile Cave

๐Ÿ”— Geography ๐Ÿ”— Romania ๐Ÿ”— Ecology ๐Ÿ”— Caves

Movile Cave (Romanian: Peศ™tera Movile) is a cave near Mangalia, Constanศ›a County, Romania discovered in 1986 by Cristian Lascu a few kilometers from the Black Sea coast. It is notable for its unique groundwater ecosystem abundant in hydrogen sulfide and carbon dioxide, but low in oxygen. Life in the cave has been separated from the outside for the past 5.5 million years and it is based completely on chemosynthesis rather than photosynthesis.

๐Ÿ”— Thermal Grill Illusion

๐Ÿ”— Biology

The thermal grill illusion is a sensory illusion originally demonstrated in 1896 by the Swedish physician Torsten Thunberg. The illusion is created by an interlaced grill of warm (e.g., 40ยฐC/104ยฐF) and cool (20ยฐC/68ยฐF) bars. When someone presses a hand against the grill, they experience the illusion of burning heat. But if the person presses against only a cool bar, only coolness is experienced; if the person presses against only a warm bar, only warmth is experienced.

Researchers have used the illusion to demonstrate that burning pain sensation is in fact a mixture of both cold and heat pain and that it is only the inhibition of the cold pain "channel" that reveals the heat component.

The illusion is demonstrated by positioning the middle finger in cold water and the ring and index fingers in warm water. Due to shortcomings in the body map - multisensory representation of the body - and this particular sensory input configuration, the brain is tricked into thinking the middle finger is in the warm water and the index and ring fingers in cold water.

In an fMRI experiment of the illusion, researchers recently observed an activation of the thalamus not seen for control stimuli. Also, activity in a portion of the right mid/anterior insula correlated with the perceived unpleasantness of the illusion.

Discussed on

๐Ÿ”— Volkswagen Currywurst

๐Ÿ”— Germany ๐Ÿ”— Food and drink ๐Ÿ”— Brands

Volkswagen currywurst is a brand of sausage manufactured by the Volkswagen car maker since 1973. It is manufactured at the company's Wolfsburg plant and sold in restaurants in its six German factories. The currywurst are also sold externally at supermarkets and football stadiums and given away to Volkswagen customers. The sausage is branded as a "Volkswagen Original Part" and has been given the part number 199 398 500 A. The product has been described as the most produced of any of Volkswagen's parts, some 6.81 million sausages being manufactured in 2018. In many recent years the company has produced more sausages than cars. A Volkswagen ketchup is also produced and sold to accompany the currywurst.

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๐Ÿ”— Ruin Marble

๐Ÿ”— Geology

Ruin marble is a kind of limestone or marble that contains light and dark patterns. It can give the impression of a ruined city scape.

It originates mostly from the city of Florence in the commune of Tuscany, in Central Italy. Its color pattern consists mainly of gray, brown and reddish, sometimes also blue and black, giving it the impression of a ruined landscape painting. The patterns (similar to Liesegang rings) develop during diagenesis due to periodic rhythmic precipitation of iron and manganese hydroxides from oxidizing aqueous fluids restricted laterally by calcite and clay filled joints.

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๐Ÿ”— List of Lists of Lists

๐Ÿ”— Lists ๐Ÿ”— Libraries

This is a list of other articles that are lists of list articles on the English Wikipedia. In other words, each of the articles linked here is an index to multiple lists on a topic. Some of the linked articles are themselves lists of lists of lists. This article is also a list of lists, and also a list itself.

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๐Ÿ”— Actuarial Notation

๐Ÿ”— Mathematics

Actuarial notation is a shorthand method to allow actuaries to record mathematical formulas that deal with interest rates and life tables.

Traditional notation uses a halo system where symbols are placed as superscript or subscript before or after the main letter. Example notation using the halo system can be seen below.

Various proposals have been made to adopt a linear system where all the notation would be on a single line without the use of superscripts or subscripts. Such a method would be useful for computing where representation of the halo system can be extremely difficult. However, a standard linear system has yet to emerge.

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๐Ÿ”— The Tunguska Event

๐Ÿ”— Soviet Union ๐Ÿ”— Russia ๐Ÿ”— Disaster management ๐Ÿ”— Skepticism ๐Ÿ”— Astronomy ๐Ÿ”— Russia/science and education in Russia ๐Ÿ”— Geology ๐Ÿ”— Russia/physical geography of Russia ๐Ÿ”— Russia/history of Russia ๐Ÿ”— Paranormal

The Tunguska event was a massive ~12 megaton explosion that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of June 30, 1908. The explosion over the sparsely populated Eastern Siberian Taiga flattened an estimated 80ย million trees over an area of 2,150ย km2 (830ย sqย mi) of forest, and eyewitness reports suggest that at least three people may have died in the event. The explosion is generally attributed to the air burst of a stony meteoroid about 50โ€“60 metres (160โ€“200 feet) in size.:โ€Šp. 178โ€Š The meteoroid approached from the east-southeast, and likely with a relatively high speed of about 27 km/s. It is classified as an impact event, even though no impact crater has been found; the object is thought to have disintegrated at an altitude of 5 to 10 kilometres (3 to 6 miles) rather than to have hit the surface of the Earth.

The Tunguska event is the largest impact event on Earth in recorded history, though much larger impacts have occurred in prehistoric times. An explosion of this magnitude would be capable of destroying a large metropolitan area. It has been mentioned numerous times in popular culture, and has also inspired real-world discussion of asteroid impact avoidance.