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| ||1521 – Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu.
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| ||1755 – Marc-Antoine Parseval, French mathematician and theorist (d. 1836)
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| ||1788 – Charles Robert Cockerell, English architect, archaeologist, and writer (d. 1863)
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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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| ||Andrew Talcott (b. 1797) was an American civil engineer and close friend of Civil War General Robert E. Lee. | | 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, English biologist, anthropologist, sociologist, and philosopher (d. 1903) | |
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| ||Paul Albert Gordan (b. 27 April 1837) was a German 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.
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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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| ||Loftus Perkins (d. 27 April 1891) was an English engineer, particularly involved in developing the practical technologies of central heating and refrigeration. Pic.
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| ||1896 – Wallace Carothers, American chemist and inventor of nylon (d. 1937)
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| ||1913 – Philip Abelson, American physicist and author (d. 2004)
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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, Ukrainian mathematician and academic (d. 1997)
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| ||1932 – Gian-Carlo Rota, Italian-American mathematician and philosopher (d. 1999)
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| ||1936 – Karl Pearson, English mathematician and academic (b. 1857)
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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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| ||Michel Marie Deza (b. 27 April 1939) was a Soviet and French mathematician, specializing in combinatorics, discrete geometry and graph theory. Pic.
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| ||Guido Castelnuovo (d. 27 April 1952) was an Italian 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]].
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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.
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| ||1981: Xerox PARC introduces the computer mouse.
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| File:Gerard_O'Neill.gif|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.
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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.
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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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