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| ||485 – Proclus, Greek mathematician and philosopher (b. 412)
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| ||1598 – Giovanni Battista Riccioli, Italian priest and astronomer (d. 1671) | | File:Giovanni_Battista_Riccioli.jpg|link=Giovanni Battista Riccioli (nonfiction)|1598: Priest and astromomer [[Giovanni Battista Riccioli (nonfiction)|Giovanni Battista Riccioli]] born. Riccioli will experiment with pendulums and falling bodies, discuss arguments concerning the motion of the Earth, and introduce the current scheme of lunar nomenclature. |
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| ||1605: Clergyman, mathematician, and astrologer Nathaniel Torporley buried.
| | File:Kerry Wendell Thornley.jpg|link=Kerry Wendell Thornley (nonfiction)|1938: Philosopher and author [[Kerry Wendell Thornley (nonfiction)|Kerry Wendell Thornley]] born. Thornley will write a manuscript, ''The Idle Warriors'', about his acquaintence Lee Harvey Oswald. |
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| File:Pierre de Fermat.jpg|link=Pierre de Fermat (nonfiction)|1627: Mathematician [[Pierre de Fermat (nonfiction)|Pierre de Fermat]] writes a marginal note about a "Last Last Theorem" which will "surely solve all cases of [[crimes against mathematical contants, both past and future."
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| ||1790 – Benjamin Franklin, American inventor, publisher, and politician, 6th President of Pennsylvania (b. 1706)
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| ||1798 – Étienne Bobillier, French mathematician and academic (d. 1840)
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| ||Samuel Morey (d. April 17, 1843) was an American inventor, who worked on early internal combustion engines and was a pioneer in steamships who accumulated a total of 20 patents.
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| ||1863 – Augustus Edward Hough Love, English mathematician and theorist (d. 1940)
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| ||Carl Wilhelm Oseen (b. 17 April 1879, Lund) was a theoretical physicist in Uppsala and Director of the Nobel Institute for Theoretical Physics in Stockholm. He formulated the fundamentals of the elasticity theory of liquid crystals (Oseen elasticity theory), as well as the Oseen equations for viscous fluid flow at small Reynolds numbers. He gave his name to the Oseen tensor and, with Horace Lamb, to the Lamb–Oseen vortex. Pic.
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| ||1882 – George Jennings, English engineer and plumber, invented the Flush toilet (b. 1810)
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| ||1895 – Robert Dean Frisbie, American soldier and author (d. 1948)
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| ||Eberhard Frederich Ferdinand Hopf (b. April 17, 1902) was a mathematician and astronomer, one of the founding fathers of ergodic theory and a pioneer of bifurcation theory who also made significant contributions to the subjects of partial differential equations and integral equations, fluid dynamics, and differential geometry. Pic.
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| File:Kerry Wendell Thornley.jpg|link=Kerry Wendell Thornley (nonfiction)|1938: Philosopher and author [[Kerry Wendell Thornley (nonfiction)|Kerry Wendell Thornley]] born. In 1962 he will write a manuscript, ''The Idle Warriors'', about his aquaintence Lee Harvey Oswald. | |
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| ||1942 – Jean Baptiste Perrin, French-American physicist and chemist, Nobel Prize laureate (b. 1870)
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| File:Wizard Jan Kochanowski.jpg|link=Jan_Kochanowski|1957: [[Jan Kochanowski]] adapts [[Nebra sky disk (nonfiction)|Nebra sky disk]] for use with [[SCORE (satellite) (nonfiction)|Project SCORE satellite]].
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| File:Atlas-B rocket with SCORE payload.jpg|link=SCORE (satellite) (nonfiction)|1958: [[SCORE (satellite) (nonfiction)|Project SCORE satellite]] incorporates [[Nebra sky disk (nonfiction)|virtual Nebra sky disk]] as backup navigation system.
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| ||1961 – Elda Anderson, American physicist and health researcher (b. 1899)
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| File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]]: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro. | | File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]]: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro. |
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| File:Baron Zersetzung.jpg|link=Baron Zersetzung|1968: Alleged crime boss [[Baron Zersetzung]] takes possession of a large quantity of military-grade [[Clandestiphrine]]. | | File:Sirhan_Sirhan.jpg|link=Assassination of Robert F. Kennedy (nonfiction)|1969: Sirhan Sirhan is convicted of [[Assassination of Robert F. Kennedy (nonfiction)|assassinating Robert F. Kennedy]]. |
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| File:Robert F. Kennedy assassination.jpg|link=Assassination of Robert F. Kennedy (nonfiction)|1969: Sirhan Sirhan is convicted of [[Assassination of Robert F. Kennedy (nonfiction)|assassinating Robert F. Kennedy]].
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| ||1970 – Apollo program: The ill-fated Apollo 13 spacecraft returns to Earth safely.
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| ||Sir Hugh Stott Taylor KBE FRS (d. 17 April 1974) was an English chemist primarily interested in catalysis. In 1925, in a landmark contribution to catalytic theory, Taylor suggested that a catalyzed chemical reaction is not catalysed over the entire solid surface of the catalyst but only at certain 'active sites' or centers. He also developed important methods for procuring heavy water during World War II and pioneered the use of stable isotopes in studying chemical reactions.
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| ||1976 – Henrik Dam, Danish biochemist and physiologist, Nobel Prize laureate (b. 1895)
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| ||Richard Dagobert Brauer (d. April 17, 1977) was a leading German and American mathematician. He worked mainly in abstract algebra, but made important contributions to number theory. He was the founder of modular representation theory.
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| ||1996 – Piet Hein, Danish poet and mathematician (b. 1905) - Danish mathematician, inventor, designer, author, and poet, often writing under the Old Norse pseudonym "Kumbel" meaning "tombstone".
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| ||Horace Richard Crane (d. April 19, 2007) was an American physicist, the inventor of the Race Track Synchrotron, a recipient of President Ronald Reagan's National Medal of Science "for the first measurement of the magnetic moment and spin of free electrons and positrons". He was also noted for proving the existence of neutrinos.
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| ||2014 – NASA's Kepler space observatory confirms the discovery of the first Earth-size planet in the habitable zone of another star. | | File:Piet Hein and H.C. Andersen.jpg|link=Piet Hein (nonfiction)|1996: Mathematician, author, and poet [[Piet Hein (nonfiction)|Piet Hein]] dies. Hein proposed the use of superellipses in architecture; superellipses subsequently became the hallmark of modern Scandinavian architecture. |
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