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| ||121 – Marcus Aurelius, Roman emperor (d. 180)
| | File:Jean_Fernel.jpg|link=Jean Fernel (nonfiction)|1558: Physician [[Jean Fernel (nonfiction)|Jean Fernel]] dies. Fernel ntroduced the term "physiology" to describe the study of the body's function, and was the first person to describe the spinal canal. |
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| ||1558 – Jean Fernel, French physician (b. 1497)
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| File:Thomas Reid.jpg|link=Thomas Reid (nonfiction)|1710: Mathematician and philosopher [[Thomas Reid (nonfiction)|Thomas Reid]] born. Reid will argue that common sense (in a special philosophical sense of ''sensus communis'') is, or at least should be, at the foundation of all philosophical inquiry. | |
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| ||1774 – Christian Leopold von Buch, German geologist and paleontologist (d. 1853)
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| File:Hans Christian Ørsted.jpg|link=Hans Christian Ørsted (nonfiction)|1797: Physicist [[Hans Christian Ørsted (nonfiction)|Hans Christian Ørsted]] uses electromagnetism to detect and prevent [[crimes against physical constants]].
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| File:Eugène Delacroix.jpg|link=Eugène Delacroix (nonfiction)|1798: Artist [[Eugène Delacroix (nonfiction)|Eugène Delacroix]] born. His use of expressive brushstrokes and his study of the optical effects of color will shape the work of the Impressionists.
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| ||1803 – Thousands of meteor fragments fall from the skies of L'Aigle, France; the event convinces European scientists that meteors exist.
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| ||Zerah Colburn (d. April 26, 1870) was an American engineer specialising in steam locomotive design, technical journalist and publisher. Pic.
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| File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1879: Printer, bookseller, and inventor [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] dies. He invented the phonoautograph, which records an audio signal as a photographic image. | | File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1879: Printer, bookseller, and inventor [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] dies. He invented the phonoautograph, which records an audio signal as a photographic image. |
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| File:Owen Richardson.jpg|link=Owen Willans Richardson (nonfiction)|1879: Physicist and academic [[Owen Willans Richardson (nonfiction)|Owen Willans Richardson]] born. He will win the 1928 Nobel Prize in Physics for his work on thermionic emission, which led to Richardson's law. | | File:Owen Richardson.jpg|link=Owen Willans Richardson (nonfiction)|1879: Physicist and academic [[Owen Willans Richardson (nonfiction)|Owen Willans Richardson]] born. He will win the 1928 Nobel Prize in Physics for his work on thermionic emission, which led to Richardson's law. |
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| ||Emil Hilb (b. 26 April 1882) was a German-Jewish mathematician who worked in the fields of special functions, differential equations, and difference equations. Pic.
| | File:Castle Union.jpg|link=Castle Union (nonfiction)|1954: [[Castle Union (nonfiction)|Castle Union]] nuclear weapons test at Bikini Atoll: the United States detonates the TX-14 thermonuclear weapon, one of the first deployed U.S. thermonuclear bombs. The explosion causes extensive fallout. Castle Union was the code name given to one of the tests in the Operation Castle series of United States nuclear tests. It was the first test of the TX-14 thermonuclear weapon (initially the "emergency capability" EC-14), one of the first deployed U.S. thermonuclear bombs. Pic. |
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| ||Guillermo Haro Barraza (d. 26 April 1988) was a Mexican astronomer. Through his own astronomical research and the formation of new institutions, Haro was influential in the development of modern observational astronomy in Mexico. Internationally, he is best known for his contribution to the discovery of Herbig–Haro objects. Pic.
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| ||1889 – Ludwig Wittgenstein, Austrian-English philosopher and academic (d. 1951) He worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.
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| ||1891: Naval engineer Gustave Zédé dies. He was a pioneering designer of submarines. Pic.
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| ||1900 – Charles Francis Richter, American seismologist and physicist (d. 1985)
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| ||David Mathias Dennison (b. April 26, 1900) was an American physicist who made contributions to quantum mechanics, spectroscopy, and the physics of molecular structure.
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| File:Edmund Husserl 1910s.jpg|link=Edmund Husserl (nonfiction)|1919: Mathematician and philosopher [[Edmund Husserl (nonfiction)|Edmund Husserl]] publishes new type of [[Gnomon algorithm]] which use transcendental consciousness as the limit of all possible knowledge to detect and erase the [[Forbidden Ratio]]. | |
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| File:Srinivasa_Ramanujan.jpg|link=Srinivasa Ramanujan (nonfiction)|1920: Mathematician and theorist [[Srinivasa Ramanujan (nonfiction)|Srinivasa Ramanujan]] dies. He made substantial contributions to mathematical analysis, number theory, infinite series, and continued fractions, including solutions to mathematical problems considered to be unsolvable.
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| ||Gyula Kosice (b. 1924) was a Czechoslovakian-born Argentine sculptor, plastic artist, and poet. He was one of the most important figures in kinetic and luminal art and luminance vanguard.
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| ||Michel André Kervaire (b. 26 April 1927) was a French mathematician who made significant contributions to topology and algebra. He introduced the Kervaire semi-characteristic.
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| ||1932 – Michael Smith, English-Canadian biochemist and geneticist, Nobel Prize laureate (d. 2000)
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| ||1933 – Arno Allan Penzias, German-American physicist and academic, Nobel Prize laureate
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| ||1933 – The Gestapo, the official secret police force of Nazi Germany, is established.
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| ||1937 – Spanish Civil War: Guernica, Spain, is bombed by German Luftwaffe.
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| ||1940 – Carl Bosch, German chemist and engineer, Nobel Prize laureate (b. 1874)
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| ||1945 – Sigmund Rascher, German physician (b. 1909) - SS deadly experiments
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| File:Vandal Savage Field Report Peenemunde.jpg|link=Field Report Number One (Peenemunde)|1945: ''[[Field Report Number One (Peenemunde)|Field Report Number One (Peenemunde edition)]]'' accidentally released new class of [[crimes against mathematical constants]].
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| ||1951 – Arnold Sommerfeld, German physicist and academic (b. 1868)
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| ||Castle Union was the code name given to one of the tests in the Operation Castle series of United States nuclear tests. It was the first test of the TX-14 thermonuclear weapon (initially the "emergency capability" EC-14), one of the first deployed U.S. thermonuclear bombs. Pic.
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| ||1962 – NASA's Ranger 4 spacecraft crashes into the Moon.
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| File:Chernobyl disaster.jpg|link=Chernobyl disaster (nonfiction)|1986: A [[Chernobyl disaster (nonfiction)|nuclear reactor accident occurs at the Chernobyl Nuclear Power Plant]] in the Soviet Union (now Ukraine). | | File:Chernobyl disaster.jpg|link=Chernobyl disaster (nonfiction)|1986: A [[Chernobyl disaster (nonfiction)|nuclear reactor accident occurs at the Chernobyl Nuclear Power Plant]] in the Soviet Union (now Ukraine). |
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| File:Egon Rhodomunde.jpg|link=Egon Rhodomunde|1987: Gem detective and arms dealer [[Egon Rhodomunde]] denies accusations that he was responsible for the [[Chernobyl disaster (nonfiction)]].
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| ||Yuval Ne'eman (d. 26 April 2006) was an Israeli theoretical physicist, military scientist, and politician. He was Minister of Science and Development in the 1980s and early 1990s. Pic.
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| ||2009 – Hans Holzer, Austrian-American paranormal investigator and author (b. 1920)
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| ||Gerald Stanford Guralnik (d. April 26, 2014) was the Chancellor’s Professor of Physics at Brown University. In 1964 he co-discovered the Higgs mechanism and Higgs boson with C. R. Hagen and Tom Kibble. Pic.
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