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| ||1620 – John Graunt, English demographer and statistician (d. 1674)
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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 and physicist [[Jean-Antoine Nollet (nonfiction)|Jean-Antoine Nollet]] discharges a battery of Leyden jars through a human chain, exposing a [[math criminal]] was posing as a priest.
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| ||Robert-Aglaé Cauchoix (b. 24 April 1776) was a French 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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| |File:Grigori Rasputin 1916.jpg|link=Grigori Rasputin (nonfiction)|1870: Mystic and faith healer [[Grigori Rasputin (nonfiction)|Grigori Rasputin]] uses [[Time travel (nonfiction)|time travel device]] to commit [[crimes against mathematical constants]].
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| |File:The Custodian.jpg|link=The Custodian|1870:[[The Custodian]] cleans up paradoxes caused by [[Grigori Rasputin (nonfiction)|Grigori Rasputin]]'s experiments in [[Time travel (nonfiction)|time travel device]].
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| ||Felix Ehrenhaft (b. 24 April 1879) was an Austrian 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, Swedish-American engineer and businessman, developed the zipper (d. 1954)
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| ||1885 – American sharpshooter Annie Oakley is hired by Nate Salsbury to be a part of Buffalo Bill's Wild West.
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| ||Oscar Zariski (born Oscher Zaritsky (b. April 24, 1899) was a Russian-born American mathematician and one of the most influential algebraic geometers of the 20th century.
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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".
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| ||1897 – Benjamin Lee Whorf, American linguist, anthropologist, and engineer (d. 1941)
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| ||1899 – Oscar Zariski, Russian-American mathematician and academic (d. 1986)
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| ||1913 – Dieter Grau, German-American scientist and engineer (d. 2014)
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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, African-American mathematician and academic (d. 2010)
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| ||Wolfgang Kurt Hermann "Pief" Panofsky (b. April 24, 1919), was a German-American 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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| ||Georg Bredig (d. April 24, 1944) was a German physical chemist. Pic.
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| ||1944 – Charles Jordan, American magician (b. 1888)
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| ||1945 – Ernst-Robert Grawitz, German physician (b. 1899)
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| ||1947 – Roger D. Kornberg, American biochemist and academic, Nobel Prize laureate
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| ||Hendrik Anthony "Hans" Kramers (d. 24 April 1952) was a Dutch physicist who worked with Niels Bohr to understand how electromagnetic waves interact with matter.
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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 – Max von Laue, German physicist and academic, Nobel Prize laureate (b. 1879)
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| ||1964 – Gerhard Domagk, German pathologist and bacteriologist (b. 1895)
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| ||Vladimir Mikhaylovich Komarov (b. 16 March 1927 – 24 April 1967) was a Soviet 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, American engineer, designed the AR-15 rifle (b. 1922)
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| ||George Michael Volkoff (d. April 24, 2000) was a Canadian physicist and academic who helped, with J. Robert Oppenheimer, predict the existence of neutron stars before they were discovered. Pic.
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