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🔗 Software 🔗 Software/Computing

Tierra is a computer simulation developed by ecologist Thomas S. Ray in the early 1990s in which computer programs compete for time (central processing unit (CPU) time) and space (access to main memory). In this context, the computer programs in Tierra are considered to be evolvable and can mutate, self-replicate and recombine. Tierra's virtual machine is written in C. It operates on a custom instruction set designed to facilitate code changes and reordering, including features such as jump to template (as opposed to the relative or absolute jumps common to most instruction sets).

🔗 Spaceflight

Quindar tones, most often referred to as the "beeps" that were heard during the American Apollo space missions, were a means by which remote transmitters on Earth were turned on and off so that the capsule communicator (CapCom) could communicate with the crews of the spacecraft. It was a means of in-band signaling to simulate the action of the push-to-talk and release-to-listen (often referred to as PTT) button commonly found on two-way radio systems and walkie-talkies.

🔗 Horticulture and Gardening 🔗 Animals 🔗 Sanitation

The nematodes ( NEM-ə-tohdz or NEEM-; Greek: Νηματώδη; Latin: Nematoda) roundworms or eelworms, constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments. Most species are free-living, feeding on microorganisms, but there are many that are parasitic. The parasitic worms (helminths) are the cause of soil-transmitted helminthiases.

They are taxonomically classified along with arthropods, tardigrades and other moulting animals in the clade Ecdysozoa. Unlike the vaguely similar flatworms, nematodes have a tubular digestive system, with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum.

Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species are uncertain. A 2013 survey of animal biodiversity published in the mega journal Zootaxa puts this figure at over 25,000. Estimates of the total number of extant species are subject to even greater variation. A widely referenced article published in 1993 estimated there may be over 1 million species of nematode. A subsequent publication challenged this claim, estimating the figure to be at least 40,000 species. Although the highest estimates (up to 100 million species) have since been deprecated, estimates supported by rarefaction curves, together with the use of DNA barcoding and the increasing acknowledgment of widespread cryptic species among nematodes, have placed the figure closer to 1 million species.

Nematodes have successfully adapted to nearly every ecosystem: from marine (salt) to fresh water, soils, from the polar regions to the tropics, as well as the highest to the lowest of elevations. They are ubiquitous in freshwater, marine, and terrestrial environments, where they often outnumber other animals in both individual and species counts, and are found in locations as diverse as mountains, deserts, and oceanic trenches. They are found in every part of the earth's lithosphere, even at great depths, 0.9–3.6 km (3,000–12,000 ft) below the surface of the Earth in gold mines in South Africa. They represent 90% of all animals on the ocean floor. In total, 4.4 × 10²⁰ nematodes inhabit the Earth's topsoil, or approximately 60 billion for each human, with the highest densities observed in tundra and boreal forests. Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity of lifecycles, and their presence at various trophic levels point to an important role in many ecosystems. They have been shown to play crucial roles in polar ecosystems. The roughly 2,271 genera are placed in 256 families. The many parasitic forms include pathogens in most plants and animals. A third of the genera occur as parasites of vertebrates; about 35 nematode species occur in humans.

Nathan Cobb, a nematologist, described the ubiquity of nematodes on Earth thus:

In short, if all the matter in the universe except the nematodes were swept away, our world would still be dimly recognizable, and if, as disembodied spirits, we could then investigate it, we should find its mountains, hills, vales, rivers, lakes, and oceans represented by a film of nematodes. The location of towns would be decipherable since, for every massing of human beings, there would be a corresponding massing of certain nematodes. Trees would still stand in ghostly rows representing our streets and highways. The location of the various plants and animals would still be decipherable, and, had we sufficient knowledge, in many cases even their species could be determined by an examination of their erstwhile nematode parasites.^(p 472)

🔗 Cryptography 🔗 Cryptography/Computer science

Shamir's Secret Sharing is an algorithm in cryptography created by Adi Shamir. It is a form of secret sharing, where a secret is divided into parts, giving each participant its own unique part.

To reconstruct the original secret, a minimum number of parts is required. In the threshold scheme this number is less than the total number of parts. Otherwise all participants are needed to reconstruct the original secret.

🔗 Military history 🔗 Military history/Military science, technology, and theory 🔗 Politics 🔗 Media 🔗 Journalism

Atrocity propaganda is the spreading of information about the crimes committed by an enemy, which can be factual, but often includes or features deliberate fabrications or exaggerations. This can involve photographs, videos, illustrations, interviews, and other forms of information presentation or reporting.

The inherently violent nature of war means that exaggeration and invention of atrocities often becomes the main staple of propaganda. Patriotism is often not enough to make people hate the enemy, and propaganda is also necessary. "So great are the psychological resistances to war in modern nations", wrote Harold Lasswell, "that every war must appear to be a war of defense against a menacing, murderous aggressor. There must be no ambiguity about who the public is to hate." Human testimony may be unreliable even in ordinary circumstances, but in wartime, it can be further muddled by bias, sentiment, and misguided patriotism.

According to Paul Linebarger, atrocity propaganda leads to real atrocities, as it incites the enemy into committing more atrocities, and, by heating up passions, it increases the chances of one's own side committing atrocities, in revenge for the ones reported in propaganda. Atrocity propaganda might also lead the public to mistrust reports of actual atrocities. In January 1944, Arthur Koestler wrote of his frustration at trying to communicate what he had witnessed in Nazi-occupied Europe: the legacy of anti-German stories during World War I, many of which were debunked in the postwar years, meant that these reports were received with considerable amounts of skepticism.

Like propaganda, atrocity rumors detailing exaggerated or invented crimes perpetrated by enemies are also circulated to vilify the opposing side. The application of atrocity propaganda is not limited to times of conflict but can be implemented to sway public opinion and create a Casus belli to declare war.

🔗 Korea 🔗 China 🔗 East Asia 🔗 Languages 🔗 Korea/one or more inactive working groups

The Sinosphere, also known as the East Asian cultural sphere, or the Sinic world, encompasses multiple countries in East Asia and Southeast Asia that historically were heavily influenced by Chinese culture, norms and traditions. According to academic consensus, the Sinosphere comprises four entities: Greater China, Japan, Korea, and Vietnam. Other definitions may include Mongolia and Singapore, largely due to limited historical Chinese influences or increasing modern-day Chinese diaspora. The Sinosphere is not to be confused with Sinophone, which indicates countries where a Chinese-speaking population is dominant.

Imperial China was a major regional power in Eastern Asia and had exerted influence on tributary states and neighboring states, among which were Japan, Korea, and Vietnam. These interactions brought ideological and cultural influences rooted in Confucianism, Buddhism, and Taoism. During classical history, the four cultures shared a common imperial system under respective emperors. Chinese inventions influenced, and were in turn influenced by, innovations of the other cultures in governance, philosophy, science, and the arts. Written Classical Chinese became the regional lingua franca for literary and scientific exchange, and Chinese characters (Hanzi) became locally adapted in Japan as Kanji, Korea as Hanja, and Vietnam as chữ Hán.

In late classical history, the literary importance of classical Chinese diminished as Japan, Korea, and Vietnam each adopted their own literary device. Japan developed the Katakana and Hiragana scripts, Korea created Hangul, and Vietnam developed chữ Nôm (which is now rarely used; the modern Vietnamese alphabet is based on the Latin alphabet). Classical literature written in Chinese characters nonetheless remains an important legacy of Japanese, Korean, and Vietnamese cultures. In the 21st century, ideological and cultural influences of Confucianism and Buddhism remain visible in high culture and social doctrines.

🔗 Germany 🔗 Brands 🔗 Automobiles 🔗 Germany/GDR

Trabant (German: [tʁaˈbant] ) is a series of small cars produced from 1957 until 1991 by former East German car manufacturer VEB Sachsenring Automobilwerke Zwickau. Four models were made: the Trabant 500, Trabant 600, Trabant 601, and the Trabant 1.1. The first model, the 500, was a relatively modern car when it was introduced.

It featured a duroplast body on a steel chassis, front-wheel drive, a transverse two-stroke engine, and independent suspension. Because this 1950s design remained largely unchanged until the introduction of the last model, the Trabant 1.1 in 1990, the Trabant became symbolic of the former East Germany's stagnant economy and the collapse of the Eastern Bloc in general. Called "a spark plug with a roof", 3,096,999 Trabants were produced. Older models have been sought by collectors in the United States due to their low cost and fewer restrictions on the importation of antique cars. The Trabant also gained a following among car tuning and rallying enthusiasts.

🔗 United States 🔗 Brands 🔗 Record Labels 🔗 United States/American music

The Edison Diamond Disc Record is a type of phonograph record marketed by Thomas A. Edison, Inc. on their Edison Record label from 1912 to 1929. They were named Diamond Discs because the matching Edison Disc Phonograph was fitted with a permanent conical diamond stylus for playing them. Diamond Discs were incompatible with lateral-groove disc record players, e.g. the Victor Victrola, the disposable steel needles of which would damage them while extracting hardly any sound. Uniquely, they are just under 1⁄4 in (6.0 mm; 0.235 in) thick.

Edison had previously made only phonograph cylinders but decided to add a disc format to the product line because of the increasingly dominant market share of the shellac disc records (later called 78s because of their typical rotational speed in revolutions per minute) made by competitors such as the Victor Talking Machine Company. Victor and most other makers recorded and played sound by a lateral or side-to-side motion of the stylus in the record groove, while in the Edison system the motion was vertical or up-and-down, known as vertical recording, as used for cylinder records. An Edison Disc Phonograph is distinguished by the diaphragm of the reproducer being parallel to the surface of the record. The diaphragm of a reproducer used for playing lateral records is at a right angle to the surface.

In the late summer and early fall of 1929 Edison also briefly produced a high-quality series of thin electrically recorded lateral-cut "Needle Type" disc records for use on standard record players.

🔗 Anthropology 🔗 Archaeology 🔗 Yorkshire

The Heslington Brain is a 2,600-year-old human brain found inside a skull buried in a pit in Heslington, Yorkshire, in England, by York Archaeological Trust in 2008. It is the oldest preserved brain ever found in Eurasia, and is believed to be the best-preserved ancient brain in the world. The skull was discovered during an archaeological dig commissioned by the University of York on the site of its new campus on the outskirts of the city of York. The area was found to have been the site of well-developed permanent habitation between 2,000–3,000 years before the present day.

A number of possibly ritualistic objects were found to have been deposited in several pits, including the skull, which had belonged to a man probably in his 30s. He had been hanged before being decapitated with a knife and his skull appears to have been buried immediately. The rest of the body was missing. Although it is not known why he was killed, it is possible that it may have been a human sacrifice or ritual murder.

The brain was found while the skull was being cleaned. It had survived despite the rest of the tissue on the skull having disappeared long ago. After being extracted at York Hospital, the brain was subjected to a range of medical and forensic examinations by York Archaeological Trust which found that it was remarkably intact, though it had shrunk to only about 20% of its original size. It showed few signs of decay, though most of its original material had been replaced by an as yet unidentified organic compound, due to chemical changes during burial.

According to the archaeologists and scientists who have examined it, the brain has a "resilient, tofu-like texture". It is not clear why the Heslington brain survived, although the presence of a wet, anoxic environment underground seems to have been an essential factor, and research is still ongoing to shed light on how the local soil conditions may have contributed to its preservation.

🔗 Mathematics

In the mathematical fields of set theory and extremal combinatorics, a sunflower or ${\displaystyle \Delta }$-system is a collection of sets whose pairwise intersection is constant. This constant intersection is called the kernel of the sunflower.

The main research question arising in relation to sunflowers is: under what conditions does there exist a large sunflower (a sunflower with many sets) in a given collection of sets? The ${\displaystyle \Delta }$-lemma, sunflower lemma, and the Erdős-Rado sunflower conjecture give successively weaker conditions which would imply the existence of a large sunflower in a given collection, with the latter being one of the most famous open problems of extremal combinatorics.