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| ||1535: The sun dog phenomenon observed over Stockholm and depicted in the famous painting Vädersolstavlan. Pic (lovely).
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| ||1650: William Bedloe born ... English spy. Pic.
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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. Pic.
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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. Pic.
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| ||1831: John Abernethy dies ... surgeon and anatomist. His ''Surgical Observations on the Constitutional Origin and Treatment of Local Diseases'' (1809) — known as "My Book", from the great frequency with which he referred his patients to it, and to page 72 of it in particular, under that name — was one of the earliest popular works on medical science. So great was his zeal in encouraging patients to read the book that he earned the nickname "Doctor My-Book". Pic.
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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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| ||1859: Ignaz Venetz dies ... engineer, naturalist, and glaciologist; as one of the first scientists to recognize glaciers as a major force in shaping the earth, he played a leading role in the foundation of glaciology. Pic.
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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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| ||1871: Slavoljub Eduard Penkala born ... engineer, invented the mechanical pencil. Pic.
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| ||1899: Charles Friedel dies ... chemist and mineralogist. riedel developed the Friedel-Crafts alkylation and acylation reactions with James Crafts in 1877, and attempted to make synthetic diamonds. Pic.
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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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| ||1918: Kai Manne Börje Siegbahn born ... physicist. Pic.
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| 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". | | 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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| ||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. Pic.
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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: Charles Sumner Tainter dies ... engineer and inventor ... scientific instrument maker, engineer and inventor, best known for his collaborations with Alexander Graham Bell, Chichester Bell, Alexander's father-in-law Gardiner Hubbard, and for his significant improvements to Thomas Edison's phonograph, resulting in the Graphophone, one version of which was the first Dictaphone. 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 Knopp dies ... mathematician who worked on generalized limits and complex functions. Pic.
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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 Thomas dies ... physicist and applied mathematician. He is best known for his contributions to atomic physics and solid-state physics. Pic.
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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: Mathematician and academic Sigmund Selberg born. Selberg studied prime numbers. Pic search.
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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. Pic.
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| ||2003: Bernard Katz dies ... biophysicist and academic, Nobel Prize laureate. Pic search.
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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: Kathleen Antonelli dies ... computer programmer and one of the six original programmers of the ENIAC, one of the first general-purpose electronic digital computers. Pic.
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| ||2006: Mathematician and academic Paul Moritz Cohn dies ... author of many textbooks on algebra. His work was mostly in the area of algebra, especially non-commutative rings. Pic.
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