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๐ The Negro Motorist Green Book
The Negro Motorist Green Book (also The Negro Motorist Green-Book, The Negro Travelers' Green Book, or simply the Green Book) was an annual guidebook for African-American roadtrippers. It was originated and published by African American, New York City mailman Victor Hugo Green from 1936 to 1966, during the era of Jim Crow laws, when open and often legally prescribed discrimination against African Americans especially and other non-whites was widespread. Although pervasive racial discrimination and poverty limited black car ownership, the emerging African-American middle class bought automobiles as soon as they could, but faced a variety of dangers and inconveniences along the road, from refusal of food and lodging to arbitrary arrest. In response, Green wrote his guide to services and places relatively friendly to African-Americans, eventually expanding its coverage from the New York area to much of North America, as well as founding a travel agency.
Many black Americans took to driving, in part to avoid segregation on public transportation. As the writer George Schuyler put it in 1930, "all Negroes who can do so purchase an automobile as soon as possible in order to be free of discomfort, discrimination, segregation and insult." Black Americans employed as athletes, entertainers, and salesmen also traveled frequently for work purposes.
African-American travelers faced hardships such as white-owned businesses refusing to serve them or repair their vehicles, being refused accommodation or food by white-owned hotels, and threats of physical violence and forcible expulsion from whites-only "sundown towns". Green founded and published the Green Book to avoid such problems, compiling resources "to give the Negro traveler information that will keep him from running into difficulties, embarrassments and to make his trip more enjoyable." The maker of a 2019 documentary film about the book offered this summary: "Everyone I was interviewing talked about the community that the Green Book created: a kind of parallel universe that was created by the book and this kind of secret road map that the Green Book outlined".
From a New York-focused first edition published in 1936, Green expanded the work to cover much of North America, including most of the United States and parts of Canada, Mexico, the Caribbean, and Bermuda. The Green Book became "the bible of black travel during Jim Crow", enabling black travelers to find lodgings, businesses, and gas stations that would serve them along the road. It was little known outside the African-American community. Shortly after passage of the Civil Rights Act of 1964, which outlawed the types of racial discrimination that had made the Green Book necessary, publication ceased and it fell into obscurity. There has been a revived interest in it in the early 21st century in connection with studies of black travel during the Jim Crow era.
Four issues (1940, 1947, 1954, and 1963) have been republished in facsimile (as of December 2017), and have sold well. Twenty-three additional issues have now been digitized by the New York Public Library Digital Collections.
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- "The Negro Motorist Green Book" | 2023-07-16 | 19 Upvotes 9 Comments
๐ The most remote tree in the world
The Tรฉnรฉrรฉ Tree (French: L'Arbre du Tรฉnรฉrรฉ) was a solitary acacia, of either Acacia raddiana or Acacia tortilis, that was once considered the most isolated tree on Earthโthe only one for over 400 kilometres (250ย mi). It was a landmark on caravan routes through the Tรฉnรฉrรฉ region of the Sahara Desert in northeast Niger, so well known that it and the Arbre Perdu (Lost Tree) to the north are the only trees to be shown on a map at a scale of 1:4,000,000. The Tree of Tรฉnรฉrรฉ was located near a 40-metre (130ย ft) deep well. It was knocked down in 1973, by a truck driver.
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- "The most remote tree in the world" | 2010-03-11 | 79 Upvotes 53 Comments
๐ Jim Lovell Has Died
James Arthur Lovell Jr. ( LUV-ษl; March 25, 1928 โ August 7, 2025) was an American astronaut, naval aviator, test pilot and mechanical engineer. In 1968, as command module pilot of Apollo 8, he became, with Frank Borman and William Anders, one of the first three astronauts to fly to and orbit the Moon. He then commanded the Apollo 13 lunar mission in 1970 which, after a critical failure en route, looped around the Moon and returned safely to Earth. He acted in a few movies, such as The Man Who Fell to Earth (1976) and Apollo 13 (1995; uncredited).
A graduate of the United States Naval Academy in Annapolis, Maryland, in the class of 1952, Lovell flew F2H Banshee night fighters. This included a Western Pacific deployment aboard the aircraft carrier USSย Shangri-La. In January 1958, he entered a six-month test pilot training course at the Naval Air Test Center at Naval Air Station Patuxent River, Maryland, with Class 20 and graduated at the top of the class. He was then assigned to Electronics Test, working with radar, and in 1960 he became the Navy's McDonnell Douglas F-4 Phantom II program manager. The following year he became a flight instructor and safety engineering officer at Naval Air Station Oceana in Virginia Beach, Virginia, and completed Aviation Safety School at the University of Southern California.
Lovell was not selected by NASA as one of the Mercury Seven astronauts due to a temporarily high bilirubin count. He was accepted in September 1962 as one of the second group of astronauts needed for the Gemini and Apollo programs. Prior to Apollo, Lovell flew in space on two Gemini missions, Gemini 7 (with Borman) in 1965 and Gemini 12 in 1966. He was the first person to fly into space four times. One of 24 people to have flown to the Moon, Lovell was the first to fly to the moon twice, and the only human to have done so without landing. He was a recipient of the Congressional Space Medal of Honor and the Presidential Medal of Freedom. He co-authored the 1994 book Lost Moon, on which the 1995 film Apollo 13 was based. Lovell was featured in a cameo appearance in the film.
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- "Jim Lovell Has Died" | 2025-08-08 | 14 Upvotes 5 Comments
๐ Literature-Based Discovery
Literature-based discovery is a form of knowledge extraction and automated hypothesis generation that uses papers and other academic publications (the "literature") to find new relationships between existing knowledge (the "discovery"). The technique was pioneered by Don R. Swanson in the 1980s and has since seen widespread use.
Literature-based discovery does not generate new knowledge through laboratory experiments, as is customary for empirical sciences. Instead it seeks to connect existing knowledge from empirical results by bringing to light relationships that are implicated and "neglected". It is marked by empiricism and rationalism in concert or consilience.
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- "Literature-Based Discovery" | 2019-08-03 | 34 Upvotes 6 Comments
๐ MONIAC โ Monetary National Income Analogue Computer
The MONIAC (Monetary National Income Analogue Computer) also known as the Phillips Hydraulic Computer and the Financephalograph, was created in 1949 by the New Zealand economist Bill Phillips (William Phillips) to model the national economic processes of the United Kingdom, while Phillips was a student at the London School of Economics (LSE). The MONIAC was an analogue computer which used fluidic logic to model the workings of an economy. The MONIAC name may have been suggested by an association of money and ENIAC, an early electronic digital computer.
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- "MONIAC โ Monetary National Income Analogue Computer" | 2019-01-07 | 38 Upvotes 6 Comments
๐ Fallacies of Distributed Computing
The fallacies of distributed computing are a set of assertions made by L Peter Deutsch and others at Sun Microsystems describing false assumptions that programmers new to distributed applications invariably make.
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- "Fallacies of Distributed Computing" | 2011-04-21 | 139 Upvotes 48 Comments
๐ Spelling of Disc
Disc and disk are both variants of the English word for objects of a generally thin and cylindrical geometry. The differences in spelling correspond both with regional differences and with different senses of the word. For example, in the case of flat, rotational data storage media the convention is that the spelling disk is used for magnetic storage (e.g., hard disks) while disc is used for optical storage (e.g., compact discs, better known as CDs). When there is no clear convention, the spelling disk is more popular in American English, while the spelling disc is more popular in British English.
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- "Spelling of Disc" | 2023-06-22 | 19 Upvotes 8 Comments
๐ George Pรณlya: How to Solve It (1945)
How to Solve It (1945) is a small volume by mathematician George Pรณlya describing methods of problem solving.
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- "George Pรณlya: How to Solve It (1945)" | 2016-12-25 | 12 Upvotes 1 Comments
๐ Limits of computation
The limits of computation are governed by a number of different factors. In particular, there are several physical and practical limits to the amount of computation or data storage that can be performed with a given amount of mass, volume, or energy.
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- "Limits of computation" | 2017-04-28 | 121 Upvotes 18 Comments
๐ Curse of the Colonel
The Curse of the Colonel (Japanese: ใซใผใใซใตใณใใผในใฎๅชใ, romanisation: Kฤneru Sandฤsu no Noroi) refers to a 1985 Japanese urban legend regarding a reputed curse placed on the Japanese Kansai-based Hanshin Tigers baseball team by the ghost of deceased KFC founder and mascot Colonel Sanders.
The curse was said to be placed on the team because of the Colonel's anger over treatment of one of his store-front statues, which was thrown into the Dลtonbori River by celebrating Hanshin fans before their team's victory in the 1985 Japan Championship Series. As is common with sports-related curses, the Curse of the Colonel was used to explain the team's subsequent 18-year losing streak. Some fans believed the team would never win another Japan Series until the statue had been recovered. They have appeared in the Japan Series three times since then, losing in 2003, 2005 and 2014.
Comparisons are often made between the Hanshin Tigers and the Boston Red Sox, who were said to be under the Curse of the Bambino until they won the World Series in 2004. The "Curse of the Colonel" has also been used as a bogeyman threat to those who would divulge the secret recipe of eleven herbs and spices that result in the unique taste of his chicken.
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- "Curse of the Colonel" | 2022-01-15 | 70 Upvotes 13 Comments