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🔗 Psychology 🔗 Anthropology 🔗 Sociology

Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships. Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".

Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. It has been proposed to lie between 100 and 250, with a commonly used value of 150. Dunbar's number states the number of people one knows and keeps social contact with, and it does not include the number of people known personally with a ceased social relationship, nor people just generally known with a lack of persistent social relationship, a number which might be much higher and likely depends on long-term memory size.

Dunbar theorised that "this limit is a direct function of relative neocortex size, and that this in turn limits group size [...] the limit imposed by neocortical processing capacity is simply on the number of individuals with whom a stable inter-personal relationship can be maintained". On the periphery, the number also includes past colleagues, such as high school friends, with whom a person would want to reacquaint himself or herself if they met again.

🔗 Internet

Cicada 3301 is a nickname given to an organization that on three occasions has posted a set of puzzles to recruit codebreakers from the public. The first internet puzzle started on January 4, 2012 on 4chan and ran for approximately one month. A second round began one year later on January 4, 2013, and then a third round following the confirmation of a fresh clue posted on Twitter on January 4, 2014. The stated intent was to recruit "intelligent individuals" by presenting a series of puzzles which were to be solved. No new puzzles were published on January 4, 2015. However, a new clue was posted on Twitter on January 5, 2016. In April 2017 a verified PGP-signed message was found: Beware false paths. Always verify PGP signature from 7A35090F. That message explicitly denies the validity of any unsigned puzzle, as recently as April 2017.

The puzzles focused heavily on data security, cryptography, steganography, internet anonymity, and surveillance.

It has been called "the most elaborate and mysterious puzzle of the internet age" and is listed as one of the "top 5 eeriest, unsolved mysteries of the internet", and much speculation exists as to its function. Many have speculated that the puzzles are a recruitment tool for the NSA, CIA, MI6, a "Masonic conspiracy" or a cyber mercenary group. Others have claimed Cicada 3301 is an alternate reality game. No company or individual has taken credit for it or attempted to monetize it, however.

🔗 Linguistics 🔗 Linguistics/Theoretical Linguistics

An agglutinative language is a type of synthetic language with morphology that primarily uses agglutination. Words may contain different morphemes to determine their meanings, but all of these morphemes (including stems and affixes) remain, in every aspect, unchanged after their unions. This results in generally more easily deducible word meanings if compared to fusional languages, which allow modifications in either or both the phonetics or spelling of one or more morphemes within a word. This usually results in a shortening of the word, or it provides easier pronunciation.

Agglutinative languages have generally one grammatical category per affix while fusional languages have multiple. The term was introduced by Wilhelm von Humboldt to classify languages from a morphological point of view. It is derived from the Latin verb agglutinare, which means "to glue together".

Non-agglutinative synthetic languages are fusional languages; morphologically, they combine affixes by "squeezing" them together, drastically changing them in the process, and joining several meanings in a single affix (for example, in the Spanish word comí "I ate", the suffix -í carries the meanings of first person, singular number, past tense, perfective aspect, indicative mood, active voice.) The term agglutinative is sometimes incorrectly used as a synonym for synthetic. Used in this way, the term embraces both fusional languages and inflected languages. The agglutinative and fusional languages are two ends of a continuum, with various languages falling more toward one or the other end. For example, Japanese is generally agglutinative, but displays fusion in otōto (弟, younger brother), from oto+hito (originally woto+pito), and in its non-affixing verb conjugations. A synthetic language may use morphological agglutination combined with partial usage of fusional features, for example in its case system (e.g., German, Dutch, and Persian).

Agglutinative languages tend to have a high rate of affixes or morphemes per word, and to be very regular, in particular with very few irregular verbs. For example, Japanese has very few irregular verbs – only two are significantly irregular, and there are only about a dozen others with only minor irregularity; Ganda has only one (or two, depending on how "irregular" is defined); while in the Quechua languages, all the ordinary verbs are regular. Korean has only ten irregular forms of conjugation except for the passive and causative conjugations. Georgian is an exception; it is highly agglutinative (with up to eight morphemes per word), but it has a significant number of irregular verbs with varying degrees of irregularity.

🔗 Military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Weaponry 🔗 Classical Greece and Rome 🔗 Military history/Classical warfare

Polybolos, meaning "multi thrower" in Greek, was an ancient Greek repeating ballista reputedly invented by Dionysius of Alexandria, a 3rd-century BC Greek engineer at the Rhodes arsenal, and used in antiquity.

Philo of Byzantium encountered and described a weapon similar to the polybolos, a catapult that like a modern machine gun could fire again and again without a need to reload. Philo left a detailed description of the gears that powered its chain drive, the oldest known application of such a mechanism, and that placed bolt after bolt into its firing slot.

🔗 United States 🔗 Mass surveillance 🔗 Espionage 🔗 Companies 🔗 Military history 🔗 Military history/North American military history 🔗 Military history/United States military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Intelligence 🔗 Cryptography 🔗 Cryptography/Computer science 🔗 Switzerland 🔗 Military history/Cold War 🔗 Sweden

Crypto AG was a Swiss company specialising in communications and information security. It was secretly jointly owned by the American Central Intelligence Agency (CIA) and West German Federal Intelligence Service (BND) from 1970 until about 1993, with the CIA continuing as sole owner until about 2018. With headquarters in Steinhausen, the company was a long-established manufacturer of encryption machines and a wide variety of cipher devices.

The company had about 230 employees, had offices in Abidjan, Abu Dhabi, Buenos Aires, Kuala Lumpur, Muscat, Selsdon and Steinhausen, and did business throughout the world. The owners of Crypto AG were unknown, supposedly even to the managers of the firm, and they held their ownership through bearer shares.

The company has been criticised for selling backdoored products to benefit the American, British and German national signals intelligence agencies, the National Security Agency (NSA), the Government Communications Headquarters (GCHQ), and the BND, respectively. On 11 February 2020, The Washington Post, ZDF and SRF revealed that Crypto AG was secretly owned by the CIA in a highly classified partnership with West German intelligence, and the spy agencies could easily break the codes used to send encrypted messages. The operation was known first by the code name "Thesaurus" and later "Rubicon".

🔗 Physics 🔗 Weather 🔗 Weather/Meteorological instruments and data

The wet-bulb temperature (WBT) is the temperature read by a thermometer covered in water-soaked cloth (a wet-bulb thermometer) over which air is passed. At 100% relative humidity, the wet-bulb temperature is equal to the air temperature (dry-bulb temperature); at lower humidity the wet-bulb temperature is lower than dry-bulb temperature because of evaporative cooling.

The wet-bulb temperature is defined as the temperature of a parcel of air cooled to saturation (100% relative humidity) by the evaporation of water into it, with the latent heat supplied by the parcel. A wet-bulb thermometer indicates a temperature close to the true (thermodynamic) wet-bulb temperature. The wet-bulb temperature is the lowest temperature that can be reached under current ambient conditions by the evaporation of water only.

Even heat-adapted people cannot carry out normal outdoor activities past a wet-bulb temperature of 32 °C (90 °F), equivalent to a heat index of 55 °C (130 °F). The theoretical limit to human survival for more than a few hours in the shade, even with unlimited water, is a wet-bulb temperature of 35 °C (95 °F) – theoretically equivalent to a heat index of 70 °C (160 °F), though the heat index does not go that high.

🔗 Biography 🔗 Iran 🔗 Biography/science and academia 🔗 Open Access

Amir Emad Mirmirani (Persian: امیرعماد میرمیرانی) known by the nickname Jadi, is a programmer, blogger and internet activist in the field of Free and open-source software and Linux in Iran. He was arrested in October 2022 during the Iranian protests following the death of Mahsa Amini.

🔗 Telecommunications 🔗 Hungary 🔗 Journalism 🔗 Project-independent assessment

The Telefon Hírmondó (also Telefonhírmondó, generally translated as "Telephone Herald") was a "telephone newspaper" located in Budapest, Hungary, which, beginning in 1893, provided news and entertainment to subscribers over telephone lines. It was both the first and the longest surviving telephone newspaper system, although from 1 December 1925 until its termination in 1944 it was primarily used to retransmit programmes broadcast by Magyar Rádió.

Three decades before the development of radio broadcasting, the Telefon Hírmondó was the first service to electronically deliver a wide range of spoken and musical programming to a diverse audience. Although its inventor envisioned that the technology could be eventually expanded to serve a national or international audience, the technical limitations of the time ultimately limited its service area to just the city of Budapest.

🔗 Africa 🔗 Africa/Botswana

The Okavango Delta (or Okavango Grassland) (formerly spelled "Okovango" or "Okovanggo") in Botswana is a swampy inland delta formed where the Okavango River reaches a tectonic trough in the central part of the endorheic basin of the Kalahari. All the water reaching the delta is ultimately evaporated and transpired and does not flow into any sea or ocean. Each year, about 11 cubic kilometres (2.6 cu mi) of water spread over the 6,000–15,000 km² (2,300–5,800 sq mi) area. Some flood waters drain into Lake Ngami. The area was once part of Lake Makgadikgadi, an ancient lake that had mostly dried up by the early Holocene.

The Moremi Game Reserve, a National Park, is on the eastern side of the Delta. The Delta was named as one of the Seven Natural Wonders of Africa, which were officially declared on 11 February 2013 in Arusha, Tanzania. On 22 June 2014, the Okavango Delta became the 1000th site to be officially inscribed on the UNESCO World Heritage List.

🔗 Freedom of speech 🔗 Journalism 🔗 Singapore

"Disneyland with the Death Penalty" is a 4,500-word article about Singapore written by William Gibson. His first major piece of non-fiction, it was first published as the cover story for Wired magazine's September/October 1993 issue (1.4).

The article follows Gibson's observations of the architecture, phenomenology and culture of Singapore, and the clean, bland and conformist impression the city-state conveys during his stay. Its title and central metaphor—Singapore as Disneyland with the death penalty—is a reference to the authoritarian artifice the author perceives the city-state to be. Singapore, Gibson details, is lacking any sense of creativity or authenticity, absent of any indication of its history or underground culture. He finds the government to be pervasive, corporatist and technocratic, and the judicial system rigid and draconian. Singaporeans are characterized as consumerists of insipid taste. The article is accentuated by local news reports of criminal trials by which the author illustrates his observations, and bracketed by contrasting descriptions of the Southeast Asian airports he arrives and leaves by.

Though Gibson's first major piece of non-fiction, the article had an immediate and lasting impact. The Singaporean government banned Wired upon the publication of the issue. The phrase "Disneyland with the death penalty" came to stand internationally for an authoritarian and austere reputation that the city-state found difficult to shake off.