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| ||1135 – Maimonides, Spanish rabbi and philosopher (April 6 also proposed, d. 1204)
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| ||1202 – Joachim of Fiore, Italian mystic and theologian (b. 1135) | | File:Adam Ries.png|link=Adam Ries (nonfiction)|1599: Mathematician [[Adam Ries (nonfiction)|Adam Ries]] dies. Reis wrote textbooks for practical mathematics, promoting the advantages of Arabic/Indian numerals over Roman numerals. |
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| File:Adam Ries.png|link=Adam Ries (nonfiction)|1599: Mathematician [[Adam Ries (nonfiction)|Adam Ries]] dies. He wrote textbooks for practical mathematics, promoting the advantages of Arabic/Indian numerals over Roman numerals. | | File:Tabulae_motuum_caelestium_universales_by_Vincentio_Reinieri_(1647).png|link=Vincentio Reinieri (nonfiction)|1606: Mathematician and astronomer [[Vincentio Reinieri (nonfiction)|Vincentio Reinieri]] born. Reinieri revised and finished the work of Galileo, who before his death placed all of the papers containing his observations and calculations in Reinieri's hands. |
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| ||1606 – Vincentio Reinieri, Italian mathematician and astronomer (d. 1647) | | File:Robert Bunsen.jpg|link=Robert Bunsen (nonfiction)|1811: Chemist and academic [[Robert Bunsen (nonfiction)|Robert Bunsen]] born. Bunsen will investigate emission spectra of heated elements, and discover caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. |
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| ||Kazimierz Łyszczyński (Polish pronunciation: [kaˈʑimjɛʂ wɨˈʂt͡ʂɨɲskʲi] (d. March 30, 1689 in Warsaw, Poland), also known in English as Casimir Liszinski, was a Polish-Lithuanian nobleman, landowner in Brest Litovsk Voivodeship of the Grand Duchy of Lithuania, philosopher, and soldier in the ranks of the Sapieha family, who was accused, tried, and executed for atheism in 1689. | | File:Stanisław Leśniewski.jpg|link=Stanisław Leśniewski (nonfiction)|1886: Mathematician, philosopher, and logician [[Stanisław Leśniewski (nonfiction)|Stanisław Leśniewski]] born. Leśniewski will posit three nested formal systems, to which he will give the Greek-derived names of protothetic, ontology, and mereology. |
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| ||1707 – Sébastien Le Prestre de Vauban, French general and engineer (b. 1633) | | File:Stefan Banach.jpg|link=Stefan Banach (nonfiction)|1892: Mathematician and academic [[Stefan Banach (nonfiction)|Stefan Banach]] born. Banach will be one of the founders of modern functional analysis. |
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| ||Jean-François Pilâtre de Rozier (b. 30 March 1754) was a French chemistry and physics teacher, and one of the first pioneers of aviation. He and the Marquis d'Arlandes made the first manned free balloon flight on 21 November 1783, in a Montgolfier balloon.
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| File:Robert Bunsen.jpg|link=Robert Bunsen (nonfiction)|1811: Chemist and academic [[Robert Bunsen (nonfiction)|Robert Bunsen]] born. He will investigate emission spectra of heated elements, and discover caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff.
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| ||1842 – Ether anesthesia is used for the first time, in an operation by the American surgeon Dr. Crawford Long.
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| ||1857 – Léon Charles Thévenin, French engineer (d. 1926) no pic
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| ||1867 – Alaska is purchased from Russia for $7.2 million, about 2-cent/acre ($4.19/km²), by United States Secretary of State William H. Seward.
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| File:Stanisław Leśniewski.jpg|link=Stanisław Leśniewski (nonfiction)|1886: Mathematician, philosopher, and logician [[Stanisław Leśniewski (nonfiction)|Stanisław Leśniewski]] born. He will posit three nested formal systems, to which he will give the Greek-derived names of protothetic, ontology, and mereology.
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| ||1888 – J. R. Williams, Canadian-born cartoonist (d. 1957)
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| File:Stefan Banach.jpg|link=Stefan Banach (nonfiction)|1892: Mathematician and academic [[Stefan Banach (nonfiction)|Stefan Banach]] born. He will be one of the founders of modern functional analysis.
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| ||1894 – Sergey Ilyushin, Russian engineer, founded Ilyushin Aircraft Company (d. 1977)
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| ||1899 – German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
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| ||1905 – Albert Pierrepoint, English hangman (d. 1992)
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| ||1910 – Józef Marcinkiewicz, Polish soldier, mathematician, and academic (d. 1940)
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| ||1919 – McGeorge Bundy, American intelligence officer and diplomat, 6th United States National Security Advisor (d. 1996)
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| ||1919 – Robin M. Williams, New Zealand mathematician and academic (d. 2013)
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| ||1922 – Arthur Wightman, American physicist and academic (d. 2013)
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| File:Hellschreiber.jpg|link=Hellschreiber (nonfiction)|1939: [[Hellschreiber (nonfiction)|Hellscreiber]] teleprinter system used to publish new biography of mathematician [[Adam Ries (nonfiction)|Adam Ries]].
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| File:Der Reichsspritzenmeister.jpg|link=Der Reichsspritzenmeister|1942: [[Der Reichsspritzenmeister]] develops new memory-wiping drug for [[Abomynous]].
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| ||Sir Charles Vernon Boys, FRS (d. 30 March 1944) was a British physicist, known for his careful and innovative experimental work.
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| ||1949 – Friedrich Bergius, German chemist and academic, Nobel Prize laureate (b. 1884)
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| ||1954: Physicist and academic Fritz Wolfgang London dies. He made fundamental contributions to the theories of chemical bonding and of intermolecular forces (London dispersion forces). With his brother Heinz London, he made a significant contribution to understanding electromagnetic properties of superconductors with the London equations.
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| ||1961 – Philibert Jacques Melotte, English astronomer (b. 1880)
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| ||Cornelis Jacobus (Cor) Gorter (b. 30 March 1980, Leiden) was a Dutch experimental and theoretical physicist. Among other work, he discovered paramagnetic relaxation and was a pioneer in low temperature physics.
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| ||1981 – U.S. President Ronald Reagan is shot in the chest outside a Washington, D.C., hotel by John Hinckley, Jr.; three others are wounded in the same incident.
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| ||1982 – Space Shuttle program: STS-3 Mission is completed with the landing of Columbia at White Sands Missile Range, New Mexico.
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| ||2008 – Roland Fraïssé, French mathematical logician (b. 1920)
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| ||2010 – Morris R. Jeppson, American lieutenant and physicist (b. 1922)
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| File:Ascleplius Myrmidon Halting Problem.jpg|link=On Halting Problems|2015: [[On Halting Problems|Asclepius Myrmidon discovers unregistered halting problem]], predicts new class of [[crimes against mathematical constants]].
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| ||2017 – SpaceX conducts the world’s first reflight of an orbital class rocket.
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