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| ||1648 – Jeanne Marie Bouvier de la Motte Guyon, French mystic (d. 1717) | | File:Richard_Trevithick.jpg|link=Richard Trevithick (nonfiction)|1771: Engineer and explorer [[Richard Trevithick (nonfiction)|Richard Trevithick]] born. Trevithick will be an early pioneer of steam-powered road and rail transport, developing the first high-pressure steam engine, and building the first full-scale working railway steam locomotive. |
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| ||Samuel Molyneux FRS (d. 13 April 1728), son of William Molyneux, was an 18th-century member of the British parliament from Kew and an amateur astronomer whose work with James Bradley attempting to measure stellar parallax led to the discovery of the aberration of light. The aberration was the first definite evidence that the earth moved and that Copernicus and Kepler were correct. In addition to his astronomical works, Molyneux wrote about the natural history and other features of Ireland. | | File:Herbert Osborn Yardley.jpg|link=Herbert Yardley (nonfiction)|1889: Cryptologist and author [[Herbert Yardley (nonfiction)|Herbert Yardley]] born. Yardley will found and lead the Black Chamber, a secret American government cryptographic organization which will break Japanese diplomatic codes, furnishing American negotiators with significant information during the Washington Naval Conference of 1921-1922. |
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| ||1771 – Richard Trevithick, Cornish-English engineer and explorer (d. 1833) | | File:Charles Renard.jpg|link=Charles Renard (nonfiction)|1905: Engineer [[Charles Renard (nonfiction)|Charles Renard]] commits suicide. Renard pioneer the design and construction of airships. He also proposed a set of preferred numbers now known as the Renard series. |
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| ||1780 – Alexander Mitchell, Irish engineer, invented the Screw-pile lighthouse (d. 1868) | | File:Mendel Sachs.jpg|link=Mendel Sachs (nonfiction)|1927: Theoretical physicist [[Mendel Sachs (nonfiction)|Mendel Sachs]] born. Sachs' work will include the proposal of a unified field theory that brings together the weak force, strong force, electromagnetism, and gravity. |
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| ||1794 – Jean Pierre Flourens, French physiologist and academic (d. 1867) Through the study of ablations on animals, he was the first to prove that the mind was located in the brain, not the heart. | | File:MKUltra proposal.jpg|link=Project MKUltra (nonfiction)|1953: CIA director Allen Dulles authorizes the secret drug research program [[Project MKUltra (nonfiction)|Project MKUltra]], intended to identify and develop drugs and procedures to be used in interrogations and torture, in order to weaken the individual and force confessions through mind control. |
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| ||1808 – Antonio Meucci, Italian-American engineer (d. 1889) Antonio Santi Giuseppe Meucci (b. 13 April 1808) was an Italian inventor and an associate of Giuseppe Garibaldi. Meucci is best known for developing a voice-communication apparatus that several sources credit as the first telephone.
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| ||1850 – Arthur Matthew Weld Downing, Irish astronomer (d. 1917)
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| ||1851 – Robert Abbe, American surgeon and radiologist (d. 1928)
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| ||1851 – William Quan Judge, Irish occultist and theosophist (d. 1896)
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| ||1853 – Leopold Gmelin, German chemist and academic (b. 1788) Leopold Gmelin (2 August 1788 – 13 April 1853) was a German chemist. Gmelin was professor at the University of Heidelberg among other things, he worked on the red prussiate and created Gmelin's test.
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| ||1870 – The New York City Metropolitan Museum of Art is founded.
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| ||Alexander Forbes Irvine Forbes (b. April 13, 1871) was a South African astronomer.
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| ||1873 – The Colfax massacre, in which more than 60 African Americans are murdered, takes place.
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| ||Francesco Severi (b. 13 April 1879) was an Italian mathematician.
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| ||1889 – Herbert Yardley, American cryptologist and author (d. 1958)
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| ||1892 – Robert Watson-Watt, Scottish engineer, invented the Radar (d. 1973)
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| ||1899 – Alfred Mosher Butts, American architect and game designer, created Scrabble (d. 1993)
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| ||Bruno Benedetto Rossi (b. 13 April 1905) was an Italian experimental physicist. He made major contributions to particle physics and the study of cosmic rays.
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| ||1909 – Stanislaw Ulam, Polish-American mathematician and academic (d. 1984)
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| ||1919 – Eugene V. Debs is imprisoned at the Atlanta Federal Penitentiary in Atlanta, Georgia, for speaking out against the draft during World War I.
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| ||1920 – Roberto Calvi, Italian banker (d. 1982)
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| File:Charles Lindbergh.jpg|link=File:Charles Lindbergh.jpg|link=Charles Lindbergh (nonfiction)|1926: Aviator [[Charles Lindbergh (nonfiction)|Charles Lindbergh]] opens service on the newly designated 278-mile (447 km) Contract Air Mail Route #2 (CAM-2) to provide service between St. Louis and Chicago (Maywood Field) with two intermediate stops in Springfield and Peoria, Illinois.
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| ||Mendel Sachs (b. April 13, 1927) was an American theoretical physicist. His scientific work includes the proposal of a unified field theory that brings together the weak force, strong force, electromagnetism, and gravity.
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| File:Seamus Heaney 1970.jpg|link=Seamus Heaney (nonfiction)|1939: Poet, playwright, translator, and lecturer [[Seamus Heaney (nonfiction)|Seamus Heaney]] born. He will receive the 1995 Nobel Prize in Literature.
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| ||1941 – Annie Jump Cannon, American astronomer and academic (b. 1863)
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| ||1943 – World War II: The discovery of mass graves of Polish prisoners of war killed by Soviet forces in the Katyń Forest Massacre is announced, causing a diplomatic rift between the Polish government-in-exile in London from the Soviet Union, which denies responsibility.
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| ||1945 – World War II: German troops kill more than 1,000 political and military prisoners in Gardelegen, Germany.
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| ||1948 – In an ambush, 78 Jewish doctors, nurses and medical students from Hadassah Hospital, and a British soldier, are massacred by Arabs in Sheikh Jarrah.
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| File:The Eel Discovers Time Travel.jpg|link=The Eel Discovers Time Travel|1952: Steganographic analysis of ''[[The Eel Discovers Time Travel]]'' reveals new class of [[Gnomon algorithm functions]] which "forecast the emergence of [[Project MKUltra (nonfiction)|Project MKUltra]] within a year."
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| File:MKUltra proposal.jpg|link=Project MKUltra (nonfiction)|1953: CIA director Allen Dulles authorizes the mind-control program [[Project MKUltra (nonfiction)|Project MKUltra]].
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| File:Palomares H-Bomb airships.jpg|link=Carnivorous dirigibles|1954: Latest generation of [[Carnivorous dirigibles]] develops artificial intelligence, leading to the escape of at least a hundred and thirty dirigibles into the upper atmosphere.
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| ||1960 – The United States launches Transit 1-B, the world's first satellite navigation system.
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| ||1970 – An oxygen tank aboard Apollo 13 explodes, putting the crew in great danger and causing major damage to the spacecraft while en route to the Moon.
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| ||1974 – Western Union (in cooperation with NASA and Hughes Aircraft) launches the United States' first commercial geosynchronous communications satellite, Westar 1.
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| ||1976 – The United States Treasury Department reintroduces the two-dollar bill as a Federal Reserve Note on Thomas Jefferson's 233rd birthday as part of the United States Bicentennial celebration.
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| ||1992 – Feza Gürsey, Turkish mathematician and physicist (b. 1921)
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| File:John Archibald Wheeler 1985.jpg|link=John Archibald Wheeler (nonfiction)|2008: Theoretical physicist [[John Archibald Wheeler (nonfiction)|John Archibald Wheeler]] dies. He linked the term "black hole" to objects with gravitational collapse, and coined the terms "quantum foam", "neutron moderator", "wormhole" and "it from bit".
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| File:The Eel.jpg|link=The Eel|2009: Art critic and alleged supervillain [[The Eel]] uses portable wormhole generator to escape [[The Nacreum]].
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