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🔗 Video games 🔗 Chess

1K ZX Chess is a 1982 chess program for the unexpanded Sinclair ZX81.

🔗 Games

The Hardest Logic Puzzle Ever is a logic puzzle so called by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. Boolos' article includes multiple ways of solving the problem. A translation in Italian was published earlier in the newspaper La Repubblica, under the title L'indovinello più difficile del mondo.

It is stated as follows:

Three gods A, B, and C are called, in no particular order, True, False, and Random. True always speaks truly, False always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, B, and C by asking three yes-no questions; each question must be put to exactly one god. The gods understand English, but will answer all questions in their own language, in which the words for yes and no are da and ja, in some order. You do not know which word means which.

Boolos provides the following clarifications: a single god may be asked more than one question, questions are permitted to depend on the answers to earlier questions, and the nature of Random's response should be thought of as depending on the flip of a fair coin hidden in his brain: if the coin comes down heads, he speaks truly; if tails, falsely.

🔗 Television 🔗 Korea 🔗 Fashion 🔗 Korea/North Korea

Let's trim our hair in accordance with the socialist lifestyle (alternatively translated as Let us trim our hair in accordance with Socialist lifestyle) is a television program that was part of a North Korean government propaganda campaign promulgating grooming and dress standards in 2004–2005.

It was broadcast on state-run Korean Central Television in the capital of Pyongyang and clips from the program were later rebroadcast on the British channel BBC One. The program claimed that hair length can affect human intelligence, in part because of the deprivation to the rest of the body of nutrients required for hair to grow. However, although some researchers have proposed that brain and hair are in competition from an evolutionary standpoint, cutting hair has no influence on its rate of growth. It was part of a longstanding North Korean government restriction campaign against haircuts and fashions deemed at odds with "Socialist values".

🔗 United States 🔗 Biography 🔗 California 🔗 Women scientists 🔗 Biography/science and academia 🔗 Astronomy 🔗 United States/Arizona 🔗 Solar System 🔗 California/California State University

Carolyn Jean Spellmann Shoemaker (June 24, 1929 – August 13, 2021) was an American astronomer and a co-discoverer of Comet Shoemaker–Levy 9. She once held the record for most comets discovered by an individual.

Although Shoemaker earned degrees in history, political science and English literature, she had little interest in science until she met and married geologist Eugene M. ("Gene") Shoemaker in 1950–51. She later said that his explanations of his work thrilled her. Despite her relative inexperience and lack of a science degree, California Institute of Technology (Caltech) had no objection to her joining Gene's team there as a research assistant. She had already shown herself to be unusually patient, and demonstrated exceptional stereoscopic vision, which were particularly valuable qualities for looking for objects in near-Earth space.

🔗 United States 🔗 International relations 🔗 Politics 🔗 Cold War

The Doomsday Clock is a symbol that represents the likelihood of a man-made global catastrophe. Maintained since 1947 by the members of the Bulletin of the Atomic Scientists, the Clock is a metaphor for threats to humanity from unchecked scientific and technical advances. The Clock represents the hypothetical global catastrophe as "midnight" and the Bulletin's opinion on how close the world is to a global catastrophe as a number of "minutes" to midnight, assessed in January of each year. The main factors influencing the Clock are nuclear risk and global warming (climate change). The Bulletin's Science and Security Board also monitors new developments in the life sciences and technology that could inflict irrevocable harm to humanity.

The Clock's original setting in 1947 was seven minutes to midnight. It has been set backward and forward 24 times since then, the largest-ever number of minutes to midnight being 17 (in 1991), and the smallest 100 seconds (1 minute and 40 seconds) in January 2020.

The clock was set at two minutes to midnight in January 2018, and left unchanged in 2019 due to the twin threats of nuclear weapons and the increasing effects of global warming. On 23 January 2020, it was moved forward to 100 seconds (1 minute 40 seconds) before midnight, based on the increased threats to global stability posed by "a nuclear blunder", exacerbated by the rate of climate change.

🔗 Computing 🔗 Computer science 🔗 Software 🔗 Software/Computing

In 1983, David H. D. Warren designed an abstract machine for the execution of Prolog consisting of a memory architecture and an instruction set. This design became known as the Warren Abstract Machine (WAM) and has become the de facto standard target for Prolog compilers.

🔗 Companies 🔗 France 🔗 Automobiles 🔗 Japan 🔗 Japan/Business and economy 🔗 Japan/Car

The Renault–Nissan–Mitsubishi Alliance, originally known as the Renault–Nissan Alliance, is a French-Japanese strategic alliance between the automobile manufacturers Renault (based in Boulogne-Billancourt, France), Nissan (based in Yokohama, Japan) and Mitsubishi Motors (based in Tokyo, Japan), which together sell more than 1 in 9 vehicles worldwide. Renault and Nissan are strategic partners since 1999 and have nearly 450,000 employees and control eight major brands: Renault, Nissan, Mitsubishi, Infiniti, Renault Korea, Dacia, Alpine, and Venucia. The car group sold 10.6 million vehicles worldwide in 2017, making it the leading light vehicle manufacturing group in the world. The Alliance adopted its current name in September 2017, one year after Nissan acquired a controlling interest in Mitsubishi and subsequently made Mitsubishi an equal partner in the Alliance.

As of December 2021, the Alliance is one of the world's leading electric vehicle manufacturing groups, with global sales of over 1 million light-duty electric vehicles since 2009. The top selling vehicles of its EV line-up are the Nissan Leaf and the Renault Zoe all-electric cars.

The strategic partnership between Renault, Nissan and Mitsubishi is not a merger or an acquisition. The three companies are joined through a cross-sharing agreement. The structure was unique in the auto industry during the 1990s consolidation trend and later served as a model for General Motors and the PSA Group, and Mitsubishi, as well as the Volkswagen Group and Suzuki, though the latter combination failed. The Alliance itself has broadened its scope substantially, forming additional partnerships with automakers including Germany's Daimler and China's Dongfeng.

Following the November 2018 arrest and imprisonment of Alliance chairman and CEO Carlos Ghosn, accompanied by his dismissal from the alliance and its components, press analysts have questioned both the stability of the Alliance's shareholding agreement and its long-term existence. These analysts also note that, because the companies' recent business strategies are interdependent, attempts to restructure the Alliance could be counter-productive for all of the members.

In January 2023, Renault and Nissan moved to restructure their alliance in order to recover from Ghosn's arrest and manage through a post-Covid economy. The primary objective was to give both companies more autonomy.

🔗 Physics 🔗 Astronomy 🔗 Time 🔗 Holidays 🔗 Festivals

A solstice is an event occurring when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around June 21 and December 21. In many countries, the seasons of the year are determined by reference to the solstices and the equinoxes.

The term solstice can also be used in a broader sense, as the day when this occurs. The day of a solstice in either hemisphere has either the most sunlight of the year (summer solstice) or the least sunlight of the year (winter solstice) for any place other than the Equator. Alternative terms, with no ambiguity as to which hemisphere is the context, are "June solstice" and "December solstice", referring to the months in which they take place every year.

The word solstice is derived from the Latin sol ("sun") and sistere ("to stand still"), because at the solstices, the Sun's declination appears to "stand still"; that is, the seasonal movement of the Sun's daily path (as seen from Earth) pauses at a northern or southern limit before reversing direction.

🔗 Physics 🔗 Weather 🔗 Weather/Weather

A light pillar is an atmospheric optical phenomenon in which a vertical beam of light appears to extend above and/or below a light source. The effect is created by the reflection of light from tiny ice crystals that are suspended in the atmosphere or that comprise high-altitude clouds (e.g. cirrostratus or cirrus clouds). If the light comes from the Sun (usually when it is near or even below the horizon), the phenomenon is called a sun pillar or solar pillar. Light pillars can also be caused by the Moon or terrestrial sources, such as streetlights and erupting volcanoes.

🔗 International relations 🔗 Death 🔗 Law 🔗 International relations/International law

A custom of the sea is a custom said to be practiced by the officers and crew of ships and boats in the open sea, as distinguished from maritime law, which is a distinct and coherent body of law governing maritime questions and offenses.

Among these customs was the practice of cannibalism among shipwrecked survivors, by the drawing of lots to decide who would be killed and eaten so that the others might survive.