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๐ X17 Particle
The X17 particle is a hypothetical subatomic particle proposed by Attila Krasznahorkay and his colleagues to explain certain anomalous measurement results. The particle has been proposed to explain wide angles observed in the trajectory paths of particles produced during a nuclear transition of beryllium-8 atoms and in stable helium atoms. The X17 particle could be the force carrier for a postulated fifth force, possibly connected with dark matter, and has been described as a protophobic (i.e., ignoring protons) X boson with a mass near 17ย MeV.
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- "X17 Particle" | 2019-11-23 | 162 Upvotes 56 Comments
๐ Edmund Thomas Clint
Edmund Thomas Clint (19 May 1976 โ 15 April 1983) was an Indian child prodigy known for having drawn over 25,000 paintings during his short life of less than seven years.
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- "Edmund Thomas Clint" | 2014-03-14 | 35 Upvotes 15 Comments
๐ Garden Hermit
Garden hermits or ornamental hermits were hermits encouraged to live in purpose-built hermitages, follies, grottoes, or rockeries on the estates of wealthy landowners, primarily during the 18th century. Such hermits would be encouraged to dress like druids and remain permanently on site, where they could be fed, cared for, and consulted for advice, or viewed for entertainment.
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- "Garden Hermit" | 2021-07-05 | 171 Upvotes 25 Comments
๐ A Mathematicianโs Apology
A Mathematician's Apology is a 1940 essay by British mathematician G. H. Hardy. It concerns the aesthetics of mathematics with some personal content, and gives the layman an insight into the mind of a working mathematician.
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- "A Mathematicianโs Apology" | 2020-02-02 | 130 Upvotes 52 Comments
๐ Queen Elizabeth II has died
Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 โ 8 September 2022) was Queen of the United Kingdom from 6ย February 1952 until her death in 2022. Her reign of 70 years and 214 days was the longest of any British monarch and the second-longest recorded of any monarch of a sovereign country. At the time of her death, Elizabeth was queen of 14 other Commonwealth realms in addition to the UK.
Elizabeth was born in Mayfair, London, as the first child of the Duke and Duchess of York (later King Georgeย VI and Queen Elizabeth). Her father acceded to the throne in 1936 upon the abdication of his brother, King Edwardย VIII, making Elizabeth the heir presumptive. She was educated privately at home and began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In November 1947, she married Philip Mountbatten, a former prince of Greece and Denmark, and their marriage lasted 73 years until his death in April 2021. They had four children together: Charles III; Anne, Princess Royal; Prince Andrew, Duke of York; and Prince Edward, Earl of Wessex.
When her father died in February 1952, Elizabethโthen 25 years oldโbecame queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon (known today as Sri Lanka), as well as Head of the Commonwealth. Elizabeth reigned as a constitutional monarch through major political changes such as the Troubles in Northern Ireland, devolution in the United Kingdom, the decolonisation of Africa, and the United Kingdom's accession to the European Communities and withdrawal from the European Union. The number of her realms varied over time as territories have gained independence and some realms have become republics. Her many historic visits and meetings include state visits to China in 1986, Russia in 1994, the Republic of Ireland in 2011, and visits with five Popes.
Significant events include Elizabeth's coronation in 1953 and the celebrations of her Silver, Golden, Diamond, and Platinum Jubilees in 1977, 2002, 2012, and 2022, respectively. Elizabeth was the longest-lived and longest-reigning British monarch, and the second-longest verifiable reigning sovereign monarch in world history, only behind Louis XIV of France. She faced occasional republican sentiment and media criticism of her family, particularly after the breakdowns of her children's marriages, her annus horribilis in 1992, and the death of her former daughter-in-law Diana, Princess of Wales, in 1997. However, support for the monarchy in the United Kingdom remained consistently high, as did her personal popularity. Elizabeth died on 8 September 2022 at Balmoral Castle, Aberdeenshire. She was succeeded by her eldest son, Charles III.
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- "Queen Elizabeth II has died" | 2022-09-08 | 11 Upvotes 1 Comments
๐ Shamir's Secret Sharing
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.
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- "Shamir's Secret Sharing" | 2023-10-27 | 12 Upvotes 3 Comments
- "Shamir's Secret Sharing" | 2018-08-18 | 177 Upvotes 45 Comments
- "Shamir's Secret Sharing" | 2016-05-16 | 66 Upvotes 16 Comments
๐ Surprisingly popular
The surprisingly popular answer is a wisdom of the crowd technique that taps into the expert minority opinion within a crowd. For a given question, a group is asked both "What do you think the right answer is?" and "What do you think the popular answer will be?" The answer that maximizes the average difference between the "right" answer and the "popular" answer is the "surprisingly popular" answer.
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- "Surprisingly popular" | 2019-07-28 | 241 Upvotes 87 Comments
๐ List of algorithms requested on Wikipedia - if you know one, do your share
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- "List of algorithms requested on Wikipedia - if you know one, do your share" | 2009-01-30 | 34 Upvotes 6 Comments
๐ Thermal Grill Illusion
The thermal grill illusion is a sensory illusion originally demonstrated in 1896 by the Swedish physician Torsten Thunberg. The illusion is created by an interlaced grill of warm (e.g., 40ยฐC/104ยฐF) and cool (20ยฐC/68ยฐF) bars. When someone presses a hand against the grill, they experience the illusion of burning heat. But if the person presses against only a cool bar, only coolness is experienced; if the person presses against only a warm bar, only warmth is experienced.
Researchers have used the illusion to demonstrate that burning pain sensation is in fact a mixture of both cold and heat pain and that it is only the inhibition of the cold pain "channel" that reveals the heat component.
The illusion is demonstrated by positioning the middle finger in cold water and the ring and index fingers in warm water. Due to shortcomings in the body map - multisensory representation of the body - and this particular sensory input configuration, the brain is tricked into thinking the middle finger is in the warm water and the index and ring fingers in cold water.
In an fMRI experiment of the illusion, researchers recently observed an activation of the thalamus not seen for control stimuli. Also, activity in a portion of the right mid/anterior insula correlated with the perceived unpleasantness of the illusion.
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- "Thermal Grill Illusion" | 2021-09-25 | 92 Upvotes 31 Comments
๐ Jewel Voice Broadcast
The Jewel Voice Broadcast (็้ณๆพ้, Gyokuon-hลsล) was the radio broadcast in which Japanese Emperor Hirohito (Emperor Shลwa ๆญๅๅคฉ็ Shลwa-tennล) read out the Imperial Rescript on the Termination of the Greater East Asia War (ๅคงๆฑไบๆฆไบ็ต็ตใ่ฉๆธ, Daitลa-sensล-shลซketsu-no-shลsho), announcing to the Japanese people that the Japanese Government had accepted the Potsdam Declaration demanding the unconditional surrender of the Japanese military at the end of World Warย II. This speech was broadcast at noon Japan Standard Time on August 15, 1945.
The speech was probably the first time that an Emperor of Japan had spoken (albeit via a phonograph record) to the common people. It was delivered in the formal, Classical Japanese that few ordinary people could easily understand. It made no direct reference to a surrender of Japan, instead stating that the government had been instructed to accept the terms of the Potsdam Declaration fully. This created confusion in the minds of many listeners who were not sure whether Japan had surrendered. The poor audio quality of the radio broadcast, as well as the formal courtly language in which the speech was composed, worsened the confusion. A digitally remastered version of the broadcast was released on 30 June 2015.
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- "Jewel Voice Broadcast" | 2019-11-07 | 30 Upvotes 3 Comments