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π Curta: a mechanical calculator
The Curta is a small mechanical calculator developed by Curt Herzstark. The Curta's design is a descendant of Gottfried Leibniz's Stepped Reckoner and Charles Thomas's Arithmometer, accumulating values on cogs, which are added or complemented by a stepped drum mechanism. It has an extremely compact design: a small cylinder that fits in the palm of the hand.
Curtas were considered the best portable calculators available until they were displaced by electronic calculators in the 1970s.
Discussed on
- "Curta" | 2023-02-05 | 66 Upvotes 12 Comments
- "Curta: a mechanical calculator" | 2015-07-17 | 28 Upvotes 6 Comments
- "Curta mechanical calculator" | 2015-01-12 | 38 Upvotes 14 Comments
- "Curta calculator - hand-held, mechanical arithmetic" | 2011-10-02 | 42 Upvotes 16 Comments
- "Curta calculator" | 2010-01-11 | 23 Upvotes 17 Comments
π TV detector van
TV detector vans are vans, which, according to the BBC, contain equipment that can detect the presence of television sets in use. The vans are operated by contractors working for the BBC, to enforce the television licensing system in the UK, the Channel Islands and on the Isle of Man. The veracity of their operation has been called into question in the media.
Discussed on
- "TV Detector Vans" | 2023-12-14 | 71 Upvotes 81 Comments
- "TV detector van" | 2019-08-08 | 151 Upvotes 327 Comments
π Capitol Hill's mystery soda machine
Capitol Hill's mystery soda machine was a Coke vending machine in Capitol Hill, Seattle, that was in operation since at least the early 1990s until its disappearance in 2018. It is unknown who stocked the machine.
Discussed on
- "Capitol Hill's mystery soda machine" | 2023-06-28 | 39 Upvotes 5 Comments
- "Capitol Hill's mystery soda machine" | 2021-07-27 | 434 Upvotes 150 Comments
π Goodhart's Law
Goodhart's law is an adage named after economist Charles Goodhart, which has been phrased by Marilyn Strathern as "When a measure becomes a target, it ceases to be a good measure." One way in which this can occur is individuals trying to anticipate the effect of a policy and then taking actions that alter its outcome.
Discussed on
- "Goodhart's Law" | 2021-09-17 | 178 Upvotes 83 Comments
- "Goodhart's Law: When a measure becomes a target, it ceases to be a good measure" | 2018-06-15 | 229 Upvotes 134 Comments
π John McCarthy Has Died
John McCarthy (September 4, 1927 β October 24, 2011) was an American computer scientist and cognitive scientist. McCarthy was one of the founders of the discipline of artificial intelligence. He coined the term "artificial intelligence" (AI), developed the Lisp programming language family, significantly influenced the design of the ALGOL programming language, popularized time-sharing, invented garbage collection, and was very influential in the early development of AI.
McCarthy spent most of his career at Stanford University. He received many accolades and honors, such as the 1971 Turing Award for his contributions to the topic of AI, the United States National Medal of Science, and the Kyoto Prize.
Discussed on
- "John McCarthy Has Died" | 2011-10-24 | 1619 Upvotes 218 Comments
π Atomic gardening
Atomic gardening is a form of mutation breeding where plants are exposed to radioactive sources, typically cobalt-60, in order to generate mutations, some of which have turned out to be useful.
The practice of plant irradiation has resulted in the development of over 2000 new varieties of plants, most of which are now used in agricultural production. One example is the resistance to verticillium wilt of the "Todd's Mitcham" cultivar of peppermint which was produced from a breeding and test program at Brookhaven National Laboratory from the mid-1950s. Additionally, the Rio Star Grapefruit, developed at the Texas A&M Citrus Center in the 1970s, now accounts for over three quarters of the grapefruit produced in Texas.
Discussed on
- "Atomic Gardening" | 2023-08-11 | 18 Upvotes 1 Comments
- "Atomic Gardening" | 2021-05-21 | 188 Upvotes 96 Comments
- "Atomic Gardening" | 2021-05-03 | 18 Upvotes 1 Comments
- "Atomic gardening" | 2015-05-15 | 22 Upvotes 4 Comments
π John Titor
John Titor (May 5, 6 or 7, 1998) is a name used on several bulletin boards during 2000 and 2001 by a poster claiming to be an American military time traveler from 2036. Titor made numerous vague and specific predictions regarding calamitous events in 2004 and beyond, including a nuclear war, none of which came true. Subsequent closer examination of Titor's assertions provoked widespread skepticism. Inconsistencies in his explanations, the uniform inaccuracy of his predictions, and a private investigator's findings all led to the general impression that the entire episode was an elaborate hoax. A 2009 investigation concluded that Titor was likely the creation of Larry Haber, a Florida entertainment lawyer, along with his brother Morey, a computer scientist.
Discussed on
- "John Titor" | 2026-07-29 | 28 Upvotes 4 Comments
- "John Titor" | 2020-03-12 | 206 Upvotes 170 Comments
π Yahoo Pipes
Yahoo! Pipes was a web application from Yahoo! that provided a graphical user interface for building data mashups that aggregate web feeds, web pages, and other services, creating Web-based apps from various sources, and publishing those apps. The application worked by enabling users to "pipe" information from different sources and then set up rules for how that content should be modified (for example, filtering). Other than the pipe editing page, the website had a documentation page and a discussion page. The documentation page contained information about pipes including guides for the pipe editor and troubleshooting. The discussion page enabled users to discuss the pipes with other users.
Discussed on
- "Yahoo Pipes" | 2022-11-23 | 159 Upvotes 57 Comments
- "Yahoo Pipes" | 2021-08-15 | 23 Upvotes 16 Comments
- "Yahoo Pipes" | 2019-11-25 | 224 Upvotes 94 Comments
π GΓΆdel's Loophole
GΓΆdel's Loophole is a "inner contradiction" in the Constitution of the United States which Austrian-German-American logician, mathematician, and analytic philosopher Kurt GΓΆdel claimed to have discovered in 1947. The flaw would have allowed the American democracy to be legally turned into a dictatorship. GΓΆdel told his friend Oskar Morgenstern about the existence of the flaw and Morgenstern told Albert Einstein about it at the time, but Morgenstern, in his recollection of the incident in 1971, never mentioned the exact problem as GΓΆdel saw it. This has led to speculation about the precise nature of what has come to be called "GΓΆdel's Loophole". It has been called "one of the great unsolved problems of constitutional law."
Discussed on
- "GΓΆdel's Loophole" | 2025-08-06 | 21 Upvotes 11 Comments
- "GΓΆdel's Loophole" | 2023-07-24 | 21 Upvotes 4 Comments
- "GΓΆdel's Loophole" | 2023-04-05 | 12 Upvotes 2 Comments
- "GΓΆdel's Loophole" | 2023-01-20 | 10 Upvotes 1 Comments
- "GΓΆdel's Loophole" | 2021-03-25 | 131 Upvotes 130 Comments
π Toast sandwich
A toast sandwich is a sandwich made with two slices of bread in which the filling is a thin slice of toasted bread, which can be heavily buttered. An 1861 recipe says to add salt and pepper to taste.
Discussed on
- "Toast Sandwich" | 2021-03-12 | 23 Upvotes 9 Comments
- "Toast sandwich" | 2016-11-24 | 39 Upvotes 19 Comments
- "Toast Sandwich" | 2013-12-01 | 178 Upvotes 144 Comments