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| ||1529 – Michael Neander, German mathematician and astronomer (d. 1581)
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| File:John Harrison.jpg|link=John Harrison (nonfiction)|1693: Carpenter and clockmaker [[John Harrison (nonfiction)|John Harrison]] born. He will invent a marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea. | | File:John Harrison.jpg|link=John Harrison (nonfiction)|1693: Carpenter and clockmaker [[John Harrison (nonfiction)|John Harrison]] born. He will invent a marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea. |
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| ||1715 – William Watson, English physician, physicist, and botanist (d. 1787)
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| ||1717 – Jacques Ozanam, French mathematician and academic (b. 1640)
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| File:Ernst Chladni.jpg|link=Ernst Chladni (nonfiction)|1827: Physicist, musician, and academic [[Ernst Chladni (nonfiction)|Ernst Chladni]] dies. He has been called both the father of acoustics and the father of meteoritics. | | File:Ernst Chladni.jpg|link=Ernst Chladni (nonfiction)|1827: Physicist, musician, and academic [[Ernst Chladni (nonfiction)|Ernst Chladni]] dies. He has been called both the father of acoustics and the father of meteoritics. |
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| ||Otto Wilhelm Fiedler (b. 3 April 1832) was a German-Swiss mathematician, known for his textbooks of geometry and his contributions to descriptive geometry.
| | File:Solomon Kullback.jpg|link=Solomon Kullback (nonfiction)|1907: Cryptanalyst and mathematician [[Solomon Kullback (nonfiction)|Solomon Kullback]] born. Krullback will begin his career with the US Army's Signal Intelligence Service (SIS) in the 1930s; when the National Security Agency (NSA) is formed in 1952, Rowlett will become chief of cryptanalysis, overseeing the research and development of computerized cryptanalysis. |
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| ||Lucien de la Rive (April 3, 1834) was a Swiss physicist. He studied electromagnetism and wrote an early article on the Theory of relativity.
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| File:Charles Grafton Page.jpg|link=Charles Grafton Page (nonfiction)|1841: Inventor and crime-fighter [[Charles Grafton Page (nonfiction)|Charles Grafton Page]] publishes new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]]. | |
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| ||1882 – American Old West: Robert Ford kills Jesse James.
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| ||1885 – Gottlieb Daimler is granted a German patent for his engine design.
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| ||1885 – Bud Fisher, American cartoonist (d. 1954)
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| ||1888 – The first of eleven unsolved brutal murders of women committed in or near the impoverished Whitechapel district in the East End of London, occurs.
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| ||Carl Gustav Axel von Harnack (d. 3 April 1888) was a German mathematician who contributed to potential theory. Harnack's inequality applied to harmonic functions. He also worked on the real algebraic geometry of plane curves, proving Harnack's curve theorem for real plane algebraic curves.
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| ||Hans Adolph Rademacher (b. 3 April 1892) was a German-born American mathematician, known for work in mathematical analysis and number theory.
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| ||1895 – The trial in the libel case brought by Oscar Wilde begins, eventually resulting in his imprisonment on charges of homosexuality.
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| ||Solomon Kullback (b. April 3, 1907) was an American cryptanalyst and mathematician, who was one of the first three employees hired by William F. Friedman at the US Army's Signal Intelligence Service (SIS) in the 1930s, along with Frank Rowlett and Abraham Sinkov.
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| ||Richard Wilhelm Heinrich Abegg (d. April 3, 1910) was a German chemist and pioneer of valence theory. He proposed that the difference of the maximum positive and negative valence of an element tends to be eight. This has come to be known as Abegg's rule. Pic.
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| ||1922 – Joseph Stalin becomes the first General Secretary of the Communist Party of the Soviet Union.
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| ||1933 – First flight over Mount Everest, a British expedition, led by the Marquis of Clydesdale, and funded by Lucy, Lady Houston.
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| ||1936 – Bruno Richard Hauptmann is executed for the kidnapping and death of Charles Augustus Lindbergh, Jr., the baby son of pilot Charles Lindbergh.
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| ||1955 – The American Civil Liberties Union announces it will defend Allen Ginsberg's book ''Howl'' against obscenity charges.
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| ||1969 – Vietnam War: United States Secretary of Defense Melvin Laird announces that the United States will start to "Vietnamize" the war effort.
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| ||1973 – Martin Cooper of Motorola makes the first handheld mobile phone call to Joel S. Engel of Bell Labs.
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| ||1975 – Bobby Fischer refuses to play in a chess match against Anatoly Karpov, giving Karpov the title of World Champion by default.
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| ||1976 – David M. Dennison, American physicist and academic (b. 1900) who made contributions to quantum mechanics, spectroscopy, and the physics of molecular structure.
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| ||1981 – The Osborne 1, the first successful portable computer, is unveiled at the West Coast Computer Faire in San Francisco.
| | File:Marion Tinsley.jpg|link=Marion Tinsley (nonfiction)|1995: Mathematician and checkers player [[Marion Tinsley (nonfiction)|Marion Tinsley]] dies. Tinsley was "to checkers what Leonardo da Vinci was to science, what Michelangelo was to art and what Beethoven was to music." |
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| ||1988 – Milton Caniff, American cartoonist (b. 1907) | |
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| ||Reinhard Gehlen (b. 3 April 1902) was a German general who was chief of the Wehrmacht Foreign Armies East (FHO) military-intelligence unit, during World War II (1942–45); spymaster of the anti–Communist Gehlen Organization for the United States (1946–56); and the first president (1956–68) of the Federal Intelligence Service (Bundesnachrichtendienst, BND) of West Germany, during the Cold War.
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| ||1996 – Suspected "Unabomber" Theodore Kaczynski is captured at his Montana cabin in the United States.
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| File:Dame Mary Lucy Cartwright.jpg|link=Mary Cartwright (nonfiction)|1998: Mathematician and academic [[Mary Cartwright (nonfiction)|Mary Cartwright]] dies. She did pioneering work in [[Chaos theory (nonfiction)|chaos theory]]. | | File:Dame Mary Lucy Cartwright.jpg|link=Mary Cartwright (nonfiction)|1998: Mathematician and academic [[Mary Cartwright (nonfiction)|Mary Cartwright]] dies. She did pioneering work in [[Chaos theory (nonfiction)|chaos theory]]. |
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| File:Mir.jpg|link=Mir (nonfiction)|1999: Sensors on the [[Mir (nonfiction)|Mir spacecraft]] detect patterns of electricity which reveal existence of a [[AESOP|vast artificial intelligence in the Earth's ionosphere]].
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| File:AESOP.jpg|link=AESOP|2000: [[AESOP]] said to be cause of prophetic dreams among the [[Mir (nonfiction)|Mir]] astronauts.
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| ||2012 – Mingote, Spanish cartoonist and journalist (b. 1919)
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| ||2014 – Fred Kida, American illustrator (b. 1920) Airboy
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| ||2016 – The Panama Papers, a leak of legal documents, reveals information on 214,488 offshore companies.
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| |File:Egon Rhodomunde.jpg|link=Egon Rhodomunde|2017: Gem detective and arms dealer [[Egon Rhodomunde]] denies accusations that he trafficks in illegal [[Time crystal (nonfiction)|time crystals (nonfiction)]].
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