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| ||1541: Celio Calcagnini dies ... astronomer. Pic: book cover.
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| ||1620: John Graunt born ... demographer and statistician. Pic.
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| File:Thomas Fincke.jpg|link=Thomas Fincke (nonfiction)|1656: Mathematician and physicist [[Thomas Fincke (nonfiction)|Thomas Fincke]] dies. He introduced the modern names of the trigonometric functions tangent and secant. | | File:Thomas Fincke.jpg|link=Thomas Fincke (nonfiction)|1656: Mathematician and physicist [[Thomas Fincke (nonfiction)|Thomas Fincke]] dies. He introduced the modern names of the trigonometric functions tangent and secant. |
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| File:Jean-Antoine Nollet.jpg|link=Jean-Antoine Nollet (nonfiction)|1746: Priest, physicist, and practical joker [[Jean-Antoine Nollet (nonfiction)|Jean-Antoine Nollet]] discharges a battery of Leyden jars through a human chain, unexpectedly generating [[gray light]], although the causes of [[gray light]] (in this case, electrical stimulation of a group of [[mathematicians]]) are poorly understood at the time.
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| ||Robert-Aglaé Cauchoix born ... optician and instrument maker, whose lenses played a part in the race of the great refractor telescopes in the first half of the 19th century. Pic: observatory.
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| File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1863: Printer, inventor, and crime-fighter [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] patents new type of phonoautograph, which records [[crimes against mathematical constants]] as photographic images.
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| ||1879: Felix Ehrenhaft born ... physicist who contributed to atomic physics, to the measurement of electrical charges and to the optical properties of metal colloids. He was known for his maverick and controversial style. Pic.
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| ||1880: Gideon Sundback born ... engineer and businessman, developed the zipper. Pic.
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| ||1885: American sharpshooter Annie Oakley is hired by Nate Salsbury to be a part of Buffalo Bill's Wild West. Pic.
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| ||1895: Joshua Slocum, the first person to sail single-handedly around the world, sets sail from Boston, Massachusetts aboard the sloop "Spray". Pic.
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| ||1897: Benjamin Lee Whorf born ... linguist, anthropologist, and engineer. Pic.
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| ||1899: Oscar Zariski born ... mathematician and academic. Pic.
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| ||1911: Irene Sänger-Bredt born ... engineer, mathematician and physicist. She is co-credited with the design of a proposed intercontinental spaceplane/bomber Pic: https://www.sciencedirect.com/science/article/pii/S0094576504001298
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| ||1913: Dieter Grau born ... scientist and engineer. Peenemunde. Pic.
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| File:Franck Hertz Hg tube.jpg|link=Franck–Hertz experiment (nonfiction)|1914: The [[Franck–Hertz experiment (nonfiction)|Franck–Hertz experiment]], a pillar of quantum mechanics, is presented to the German Physical Society. | | File:Franck Hertz Hg tube.jpg|link=Franck–Hertz experiment (nonfiction)|1914: The [[Franck–Hertz experiment (nonfiction)|Franck–Hertz experiment]], a pillar of quantum mechanics, is presented to the German Physical Society. |
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| File:John_Fleming_in_Fleming_tube.jpg|link=John Ambrose Fleming (nonfiction)|1915: Miniaturized version of [[John Ambrose Fleming (nonfiction)|John Ambrose Fleming]] delivers lecture from within Fleming tube.
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| ||1919: David Blackwell born ... statistician and mathematician who made significant contributions to game theory, probability theory, information theory, and Bayesian statistics. He is one of the eponyms of the Rao–Blackwell theorem. Pic.
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| ||1919: Wolfgang Kurt Hermann "Pief" Panofsky born ... physicist.
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| ||1922: The first segment of the Imperial Wireless Chain providing wireless telegraphy between Leafield in Oxfordshire, England, and Cairo, Egypt, comes into operation.
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| ||1942: Leonid Kulik dies ... minerologist who conducted the first scientific expedition (for which records survive) to study the Tungusta meteor impact site. He began in 1927, and continued to work on the investigation until, while fighting for his country in WW II, he was captured and died of typhus in a Nazi prison camp. Pic.
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| ||1944: Georg Bredig dies ... physical chemist. Pic.
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| ||1944: Charles Jordan dies ... magician.
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| ||1945: Ernst-Robert Grawitz dies ... physician.
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| ||1947: Roger D. Kornberg born ... biochemist and academic, Nobel Prize laureate. (Alive August 2018.)
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| ||1952: Hans Kramers dies ... physicist who worked with Niels Bohr to understand how electromagnetic waves interact with matter. Pic.
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| File:Soyuz 1 patch.png|link=Soyuz 1 (nonfiction)|1967: Cosmonaut Vladimir Komarov dies in [[Soyuz 1 (nonfiction)|Soyuz 1]] when its parachute fails to open. He is the first human to die during a space mission. | | File:Soyuz 1 patch.png|link=Soyuz 1 (nonfiction)|1967: Cosmonaut Vladimir Komarov dies in [[Soyuz 1 (nonfiction)|Soyuz 1]] when its parachute fails to open. He is the first human to die during a space mission. |
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| ||1960: Harold Frederick Pitcairn dies ... aviation inventor and pioneer. He played a key role in the development of the autogyro and founded the Autogiro Company of America. He patented a number of innovations relating to rotary wing aircraft. Pic.
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| ||1960: Max von Laue dies ... physicist and academic, Nobel Prize laureate.
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| ||1964: Gerhard Domagk dies ... pathologist and bacteriologist.
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| ||1967: Vladimir Mikhaylovich Komarov dies ... test pilot, aerospace engineer and cosmonaut. In October 1964, he commanded Voskhod 1, the first spaceflight to carry more than one crew member. He became the first cosmonaut to fly in space twice when he was selected as the solo pilot of Soyuz 1, the first manned test flight of a new spacecraft. A parachute failure caused his Soyuz capsule to crash into the ground after re-entry on 24 April 1967, making him the first human to die in a space flight. Pic.
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| ||1980: Eight U.S. servicemen die in Operation Eagle Claw as they attempt to end the Iran hostage crisis.
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| ||1990: STS-31: The Hubble Space Telescope is launched from the Space Shuttle Discovery.
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| ||1997: Eugene Stoner dies ... engineer, designed the AR-15 rifle. Pic.
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| ||2000: George Michael Volkoff dies ... physicist and academic who helped, with J. Robert Oppenheimer, predict the existence of neutron stars before they were discovered. Pic.
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| Two_Creatures_2.jpg|link=Two Creatures 2 (nonfiction)|2016: Signed first edition of ''[[Two Creatures 2 (nonfiction)|Two Creatures 2]]'' used in [[high-energy literature]] experiment unexpectedly develops spontaneous [[Artificial intelligence (nonfiction)|artificial intelligence]].
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| | {{Template:Categories: April 24}} |
