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| || *** DONE: Pics ***
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| ||1521: Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu. Pic.
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| ||1755: Marc-Antoine Parseval born ... mathematician and theorist. No pic online.
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| ||1788: Charles Robert Cockerell born ... architect, archaeologist, smuggler, and writer. Pic.
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| File:Samuel_Morse_1840.jpg|link=Samuel Morse (nonfiction)|1791: Painter and inventor [[Samuel Morse (nonfiction)|Samuel Morse]] born. He will co-invent the Morse code. | | File:Samuel_Morse_1840.jpg|link=Samuel Morse (nonfiction)|1791: Painter and inventor [[Samuel Morse (nonfiction)|Samuel Morse]] born. He will co-invent the Morse code. |
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| ||1797: Andrew Talcott born ... civil engineer and close friend of Civil War General Robert E. Lee. Pic.
| | File:Paul_Albert_Gordan.jpg|link=Paul Gordon (nonfiction)|1837: Mathematician [[Paul Gordon (nonfiction)|Paul Albert Gordan]] born. Gordon was known as "the king of invariant theory". |
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| ||1820: Herbert Spencer born ... biologist, anthropologist, sociologist, and philosopher. Pic. | |
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| ||1837: Paul Albert Gordan born ... mathematician. He was known as "the king of invariant theory". Pic. | |
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| ||1861: American President Abraham Lincoln suspends the writ of habeas corpus. Pic.
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| File:Mark Twain Interviews Wallace War-Heels.jpg|link=Mark Twain Interviews Wallace War-Heels|1869: Only known copy of ''[[Mark Twain Interviews Wallace War-Heels|Interview with Wallace War-Heels]]'' is stolen by [[Baron Zersetzung]]. [[Mark Twain (nonfiction)|Twain]] and [[Wallace War-Heels|War-Heels]] will soon team up to recover the illustration.
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| ||1872: Stefan Meyer born ... physicist involved in research on radioactivity. He became director of the Institute for Radium Research in Vienna and received the Lieben Prize in 1913 for his research on radium. Pic: https://es.wikipedia.org/wiki/Stefan_Meyer
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| ||1891: Loftus Perkins dies ... engineer, particularly involved in developing the practical technologies of central heating and refrigeration. Pic.
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| ||1896: Wallace Carothers born ... chemist and inventor of nylon. Pic (tech).
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| ||1907: Eric Malcolm Jones born ... British intelligence officer who was director of the British signals intelligence agency, GCHQ from 1952 to 1960. Pic search.
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| ||1913: Philip Abelson born ... physicist and author. Pic.
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| File:Irving Adler age 75.jpg|link=Irving Adler (nonfiction)|1913: Mathematician, author, activist, and academic [[Irving Adler (nonfiction)|Irving Adler]] born. He will be a plaintiff in the McCarthy-era case ''Adler vs. Board of Education''. | | File:Irving Adler age 75.jpg|link=Irving Adler (nonfiction)|1913: Mathematician, author, activist, and academic [[Irving Adler (nonfiction)|Irving Adler]] born. He will be a plaintiff in the McCarthy-era case ''Adler vs. Board of Education''. |
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| ||1920: Mark Krasnosel'skii born ... mathematician and academic. Pic search.
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| ||1932: Gian-Carlo Rota born ... mathematician and philosopher. Pic (blackboard pose).
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| ||1936: Karl Pearson dies ... mathematician and academic. Pic.
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| File:Myoglobin John Kendrew.jpg|link=John Kendrew (nonfiction)|1937: Biochemist and crime-fighter [[John Kendrew (nonfiction)|John Kendrew]] uses data from X-ray crystallography experiments to predict and prevent [[crimes against physical constants]].
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| File:Edmund Husserl 1910s.jpg|link=Edmund Husserl (nonfiction)|1938: Mathematician and philosopher [[Edmund Husserl (nonfiction)|Edmund Husserl]] dies. He argued that transcendental consciousness sets the limits of all possible knowledge. | | File:Edmund Husserl 1910s.jpg|link=Edmund Husserl (nonfiction)|1938: Mathematician and philosopher [[Edmund Husserl (nonfiction)|Edmund Husserl]] dies. He argued that transcendental consciousness sets the limits of all possible knowledge. |
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| ||1929: Michel Marie Deza born ... mathematician, specializing in combinatorics, discrete geometry and graph theory. Pic.
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| ||1952: Guido Castelnuovo dies ... mathematician. He is best known for his contributions to the field of algebraic geometry, though his contributions to the study of statistics and probability theory are also significant. Pic.
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| File:Components of a Nomogram.png|link=Nomogram (nonfiction)|1953: In a landmark criminal mathematics trial, an undercover [[Nomogram (nonfiction)|Nomogram]] gives testimony against criminal mathematical functions [[Gnotilus]] and [[Forbidden Ratio]].
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| ||1953: Operation Moolah offers $50,000 to any pilot who defected with a fully mission-capable Mikoyan-Gurevich MiG-15 to South Korea. The first pilot was to receive $100,000.
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| File:Nixon April-29-1974.jpg|link=Watergate scandal (nonfiction)|1978: Former United States President Nixon aide John D. Ehrlichman is released from an Arizona prison after serving 18 months for [[Watergate scandal (nonfiction)|Watergate]]-related crimes. | | File:Nixon April-29-1974.jpg|link=Watergate scandal (nonfiction)|1978: Former United States President Nixon aide John D. Ehrlichman is released from an Arizona prison after serving 18 months for [[Watergate scandal (nonfiction)|Watergate]]-related crimes. |
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| File:AESOP.jpg|link=AESOP|1979: Orbital artificial intelligence [[AESOP]] makes contact with space activist and detective [[Gerard K. O'Neill (nonfiction)|Gerard K. O'Neill]].
| | </gallery> |
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| ||1978: Guido Stampacchia dies ... mathematician, known for his work on the theory of variational inequalities, the calculus of variation and the theory of elliptic partial differential equations. Pic.
| | {{Template:Categories: April 27}} |
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| ||1981: Xerox PARC introduces the computer mouse.
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| File:Gerard_Kitchen_O'Neill.jpg|link=Gerard K. O'Neill (nonfiction)|1992: Physicist and space activist [[Gerard K. O'Neill (nonfiction)|Gerard Kitchen O'Neill]] dies. He invented particle storage rings and mass drivers; in the 1970s he developed a plan to build human settlements in outer space.
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| ||1995: Peter Maurice Wright dies ... principal scientific officer for MI5, the British counter-intelligence agency. His book Spycatcher became an international bestseller with sales of over two million copies. Spycatcher was part memoir, part exposé of what Wright claimed were serious institutional failings in MI5 and his subsequent investigations into those. Pic search.
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| ||1996: William Colby dies ... intelligence officer, 10th Director of Central Intelligence. Pic.
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| ||2002: Felix Villars dies ... professor of physics at MIT. He is best known for the Pauli–Villars regularization, an important principle in quantum field theory Pic: http://news.mit.edu/2002/villars
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| ||2007: Jean Morlet dies ... geophysicist who pioneered work in the field of wavelet analysis around the year 1975. He invented the term wavelet to describe the functions he was using. Pic search.
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| ||2008: David E. Muller dies ... mathematician, computer scientist, and academic. He will invent the Muller C-element, a device used to implement asynchronous circuitry in electronic computers, and the Muller automata, an automaton model for infinite words. In geometric group theory Muller is known for the Muller–Schupp theorem, joint with Paul Schupp, characterizing finitely generated virtually free groups as finitely generated groups with context-free word problem. Pic search.
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| ||2011: Cyrus Derman dies ... mathematician and amateur musician who did research in Markov decision process, stochastic processes, operations research, statistics and a variety of other fields. Pic.
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| ||2015: Alexander Rich dies ... biologist, biophysicist, and academic. Pic search.
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| File:Creature_4.jpg|link=Creature 4 (nonfiction)|2018: Signed first edition of ''[[Creature 4 (nonfiction)|Creature 4]]'' sells for $500,000 USD in charity auction to benefit victims of [[crimes against mathematical constants]].
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| </gallery>
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