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| ||1535: The sun dog phenomenon observed over Stockholm and depicted in the famous painting Vädersolstavlan.
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| File:Petrus Apianus.jpg|link=Petrus Apianus (nonfiction)|1548: Mathematician, astronomer, and alleged time-traveller [[Petrus Apianus (nonfiction)|Petrus Apianus]] publishes ''Cosmographicus furatis'', his magisterial treatise on [[crimes against astronomical constants]].
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| ||1650: William Bedloe born ... English spy.
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| File:Oliver Cromwell by Samuel Cooper.jpg|link=Oliver Cromwell (nonfiction)|1653: [[Oliver Cromwell (nonfiction)|Oliver Cromwell]] dissolves the Rump Parliament.
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| ||1745: Philippe Pinel born ... physician and psychiatrist.
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| File:Johann Friedrich Pfaff.jpg|link=Johann Friedrich Pfaff (nonfiction)|1790: Mathematician and detective [[Johann Friedrich Pfaff (nonfiction)|Johann Friedrich Pfaff]] uses partial differential equations of the first order Pfaffian systems to track and erase the [[Forbidden Ratio]].
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| ||1809: James David Forbes born ... physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer.
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| ||1831: John Abernethy dies ... surgeon and anatomist.
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| ||1836: Eli Whitney Blake, Jr. born ... scientist and academic.
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| ||1851: Siegmund Lubin born ... businessman, founded the Lubin Manufacturing Company.
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| ||1862: Louis Pasteur and Claude Bernard complete the experiment falsifying the theory of spontaneous generation.
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| ||1865: Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion.
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| File:Curie_and_radium_by_Castaigne.jpg|link=Radium (nonfiction)|1902: Pierre and Marie Curie refine [[Radium (nonfiction)|radium chloride]]. | | File:Curie_and_radium_by_Castaigne.jpg|link=Radium (nonfiction)|1902: Pierre and Marie Curie refine [[Radium (nonfiction)|radium chloride]]. |
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| File:Tempest prognosticator.jpg|link=Tempest prognosticator (nonfiction)|1903: Leeches in [[Tempest prognosticator (nonfiction)|Tempest prognosticator]] go on strike, demanding "less tempest and more prognostication." | | File:Karl Ferdinand Braun.jpg|link=Karl Ferdinand Braun (nonfiction)|1918: Physicist and academic [[Karl Ferdinand Braun (nonfiction)|Karl Ferdinand Braun]] dies. Braun contributed significantly to the development of radio and television technology, sharing the 1909 Nobel Prize in Physics with [[Guglielmo Marconi (nonfiction)|Guglielmo Marconi]] "for their contributions to the development of wireless telegraphy". |
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| ||1918: Kai Manne Börje Siegbahn born ... physicist.
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| ||1918: Karl Ferdinand Braun dies ... physicist and academic, Nobel Prize laureate.
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| ||1924: Lou Blonger dies ... Wild West saloonkeeper, gambling-house owner, and mine speculator, but is best known as the kingpin of an extensive ring of confidence tricksters that operated for more than 25 years in Denver, Colorado. His "Million-Dollar Bunco Ring" was brought to justice in a famous trial in 1923. Pic. | |
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| ||1925: Eric Magnus Campbell Tigerstedt inventor ... the "Thomas Edison of Finland". He was a pioneer of sound-on-film technology and made significant improvements to the amplification capacity of the vacuum valve. Pic.
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| ||1927: K. Alex Müller born ... Swiss physicist and academic, Nobel Prize laureate (alive August 2018).
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| ||1928: Robert Byrne born ... chess player and author.
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| File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]]. | | File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]]. |
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| File:The Safe-Cracker.jpg|link=The Safe-Cracker|1933: Art critic and alleged time-traveller The Eel is [[The Safe-Cracker|caught in the act of cracking a safe]]''.
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| ||1933: Boris Lvovich Rosing dies ... scientist and inventor in the field of television Pic.
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| ||1940: George Oster born ... mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/
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| ||1945: Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school.
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| File:Georg_Feigl.jpg|link=Georg Feigl (nonfiction)|1945: Mathematician [[Georg Feigl (nonfiction)|Georg Feigl]] dies. He worked on the foundations of geometry and topology, studying fixed point theorems for ''n''-dimensional manifolds. Feigl was one of the initial authors of the ''Mathematisches Wörterbuch''. | | File:Georg_Feigl.jpg|link=Georg Feigl (nonfiction)|1945: Mathematician [[Georg Feigl (nonfiction)|Georg Feigl]] dies. He worked on the foundations of geometry and topology, studying fixed point theorems for ''n''-dimensional manifolds. Feigl was one of the initial authors of the ''Mathematisches Wörterbuch''. |
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| ||1957: Konrad Hermann Theodor Knopp dies ... mathematician who worked on generalized limits and complex functions.
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| File:Baron Zersetzung.jpg|link=Baron Zersetzung|1960: Industrialist, public motivational speaker, and alleged crime boss [[Baron Zersetzung]] calls the upcoming [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] "a rock-solid business investment which is certain to generate handsome returns for early investors."
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| File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: Failure of the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] of US-backed Cuban exiles against Cuba. | | File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: Failure of the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] of US-backed Cuban exiles against Cuba. |
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| File:Clandestiphrine proposal.jpg|link=Clandestiphrine|1962: Traces of [[Clandestiphrine]] residue are detected at the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs]], raising questions about CIA involvement with [[transdimensional drugs]]. | | File:Clandestiphrine proposal.jpg|link=Clandestiphrine|1962: Traces of [[Clandestiphrine]] residue are detected at the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs]], raising questions about CIA involvement with [[transdimensional drugs]]. |
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| || Apollo 16 engineers decide if Apollo 16 should land on the moon group photo: https://commons.wikimedia.org/wiki/File:Apollo_16_meeting.jpg
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| ||1972: Apollo 16, commanded by John Young, lands on the moon.
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| ||1992: Llewellyn Hilleth Thomas dies ... physicist and applied mathematician. He is best known for his contributions to atomic physics.
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| ||1992: Gian Carlo Wick dies ... theoretical physicist who made important contributions to quantum field theory. The Wick rotation, Wick contraction, Wick's theorem, and the Wick product are named after him. Pic.
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| ||1994: Sigmund Selberg born ... mathematician.
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| ||2001: David Gilbarg dies ... mathematician, and a professor emeritus at Stanford University. Gilbarg was co-author, together with his student Neil Trudinger, of the book Elliptic Partial Differential Equations of Second Order.
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| ||2003: Bernard Katz dies ... biophysicist and academic, Nobel Prize laureate.
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| ||2004: Gravity Probe B (GP-B) launched ... a satellite-based mission which launched on 20 April 2004 on a Delta II rocket. The spaceflight phase lasted until 2005; its aim was to measure spacetime curvature near Earth, and thereby the stress–energy tensor (which is related to the distribution and the motion of matter in space) in and near Earth. This provided a test of general relativity, gravitomagnetism and related models. Pic.
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| ||2006: Mathematician and academic Paul Moritz Cohn cies ... author of many textbooks on algebra. His work was mostly in the area of algebra, especially non-commutative rings. Pic.
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| File:Two Creatures 6.jpg|link=Two Creatures 6 (nonfiction)|2018: Chromatographic analysis of ''[[Two Creatures 6 (nonfiction)|Two Creatures 6]]'' unexpectedly reveals previously unknown [[Color (nonfiction)|color]].
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