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| File:English Lottery 1566 Scroll.jpg|link=Lottery (nonfiction)|1572: New method for predicting [[Lottery (nonfiction)|lottery winners]] reveals new class of [[crimes against mathematical constants]]. | | File:Michael_Stifel.jpg|link=Michael Stifel (nonfiction)|1567: Mathematician, monk, and academic [[Michael Stifel (nonfiction)|Michael Stifel]] dies. Stifel was an Augustinian who became an early supporter of Martin Luther. |
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| ||1624 – Henrik Rysensteen, Dutch military engineer (d. 1679) | | File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1860: On his phonautograph machine, [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] makes the oldest known recording of an audible human voice. |
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| ||1770 – Thomas Johann Seebeck, German physicist and academic (d. 1831) | | File:Flying Bison.jpg|link=Flying bison|1882: Large herd of [[Flying bison]] (''Bison pterobonasus'') swarms from Saint Paul, Minnesota to New Minneapolis, Canada. |
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| ||Gustav Theodor Fechner (b. 19 April 1801), was a German philosopher, physicist and experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics, he inspired many 20th century scientists and philosophers. He is also credited with demonstrating the non-linear relationship between psychological sensation and the physical intensity of a stimulus via the formula: {\displaystyle S=K\ln I} {\displaystyle S=K\ln I}, which became known as the Weber–Fechner law. Pic. | | File:Glenn Seaborg.jpg|link=Glenn T. Seaborg (nonfiction)|1912: Chemist [[Glenn T. Seaborg (nonfiction)|Glenn T. Seaborg]] born. Seaborg will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements. |
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| ||1806 – Isambard Kingdom Brunel, English engineer, designed the Clifton Suspension Bridge (d. 1859) | | File:Walter Kohn.jpg|link=Walter Kohn (nonfiction)|2016: Theoretical physicist, theoretical chemist, and Nobel laureate [[Walter Kohn (nonfiction)|Walter Kohn]] dies. Kohn developed density functional theory, which makes it possible to calculate quantum mechanical electronic structure by equations involving the electronic density. |
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| ||1830 – Eadweard Muybridge, English photographer and cinematographer (d. 1904)
| | File:Great Nerd Giveaway Poster.png|link=Minicon 54 (nonfiction)|2019: The [[Minicon 54 (nonfiction)|Minicon 54 Great Nerd Giveaway]] begins. By the end of Minicon 54, hundreds of nerd items will have found new homes, generating an abundance of fun in the process. |
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| ||José Echegaray y Eizaguirre (b. 19 April 1832) was a Spanish civil engineer, mathematician, statesman, and one of the leading Spanish dramatists of the last quarter of the 19th century. He was awarded the 1904 Nobel Prize for Literature "in recognition of the numerous and brilliant compositions which, in an individual and original manner, have revived the great traditions of the Spanish drama".
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| ||Professor Robert Jameson FRS FRSE (11 July 1774 – 19 April 1854) was a Scottish naturalist and mineralogist. Pic.
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| ||1860 – On his phonautograph machine, Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.
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| ||Richard Edler von Mises (b. 19 April 1883) was a scientist and mathematician who worked on solid mechanics, fluid mechanics, aerodynamics, aeronautics, statistics and probability theory.
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| ||Leonida Tonelli (b. 19 April 1885) was an Italian mathematician, noted for creating Tonelli's theorem, a variation of Fubini's theorem, and for introducing semicontinuity methods as a common tool for the direct method in the calculus of variations.
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| ||1889 – Michel Eugène Chevreul, French chemist and academic (b. 1786)
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| ||Charles Ehresmann (b. 19 April 1905) was a French mathematician who worked in differential topology and category theory. He was an early member of the Bourbaki group, and is known for his work on the differential geometry of smooth fiber bundles, notably the Ehresmann connection, the concept of jets of a smooth map, and his seminar on category theory.
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| File:Glenn Seaborg.jpg|link=Glenn T. Seaborg (nonfiction)|1912: Chemist [[Glenn T. Seaborg (nonfiction)|Glenn T. Seaborg]] born. He will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements. | |
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| File:Havelock_and_Tesla_telecommunications_research.jpg|link=Havelock and Tesla Research Telecommunication|1913: ''[[Havelock and Tesla Research Telecommunication]]'' wins Pulitzer Prize, hailed as "the most prescient illustration of the decade".
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| File:Charles Sanders Peirce in 1859.jpg|link=Charles Sanders Peirce (nonfiction)|1914: Mathematician and philosopher [[Charles Sanders Peirce (nonfiction)|Charles Sanders Peirce]] dies. He is remembered as "the father of pragmatism".
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| ||1918 – Jørn Utzon, Danish architect, designed the Sydney Opera House (d. 2008)
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| ||1919 – J. Presper Eckert, American engineer, invented the ENIAC (d. 1995)
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| ||1921 – Mary Jackson, African American mathematician and aerospace engineer (d. 2005)
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| ||1930 – F. Albert Cotton, American chemist and academic (d. 2007)
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| ||1945 – The United States Atomic Energy Commission is formed.
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| ||1951 – Vilhelm Bjerknes, Norwegian physicist and meteorologist (b. 1862)
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| ||1959 – Project Mercury: NASA announces the selection of the United States' first seven astronauts, whom the news media quickly dub the "Mercury Seven".
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| File:Brion Gysin scrying engine Dreamachine.jpg|link=Brion Gysin|1965: [[Brion Gysin]] uses [[scrying engine]] technology to predict th eoutcome of [[Lottery (nonfiction)|lotteries]] with near-quantum accuracy.
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| ||1981 – The U.S. Navy nuclear submarine USS George Washington accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it.
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| ||2002 – Leopold Vietoris, Austrian soldier, mathematician, and academic (b. 1891)
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| ||2007 – Dorrit Hoffleit, American astronomer and academic (b. 1907)
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| ||2015 – Alexander Dalgarno, English physicist and academic (b. 1928)
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| ||2016 – Duane Clarridge, American spy (b. 1932)
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| ||Walter Kohn (d. April 19, 2016) was an Austrian-born American theoretical physicist and theoretical chemist. He was awarded, with John Pople, the Nobel Prize in chemistry in 1998. The award recognized their contributions to the understandings of the electronic properties of materials.
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