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| File:John Arbuthnot.jpg|link=John Arbuthnot (nonfiction)|1667: Physician, satirist, and polymath [[John Arbuthnot (nonfiction)|John Arbuthnot]] born. He will invent the figure of John Bull. | | File:John Arbuthnot.jpg|link=John Arbuthnot (nonfiction)|1667: Physician, satirist, and polymath [[John Arbuthnot (nonfiction)|John Arbuthnot]] born. He will invent the figure of John Bull. |
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| File:David Rittenhouse by Charles Wilson Peale.jpg|link=David Rittenhouse (nonfiction)|link=David Rittenhouse (nonfiction)|1756: Inventor, astronomer, mathematician, clockmaker, and surveyor [[David Rittenhouse (nonfiction)|David Rittenhouse]] constructs an exceptionally accurate [[Orrery (nonfiction)|orrery]], which he will later use to create an early form of [[Time crystal (nonfiction)|time crystals (nonfiction)]].
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| ||1768 – Georg Brandt, Swedish chemist and mineralogist (b. 1694)
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| ||1793 – John Michell, English geologist and astronomer (b. 1724)
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| ||1833 – William Babington, Anglo-Irish physician and mineralogist (b. 1756)
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| ||William Edward Story (b. April 29, 1850) was an American mathematician
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| File:Henri Poincaré.jpg|link=Henri Poincaré (nonfiction)|1854: Mathematician, physicist, and engineer [[Henri Poincaré (nonfiction)|Henri Poincaré]] born. He will make many original fundamental contributions to pure and applied mathematics, mathematical physics, and celestial mechanics. | | File:Henri Poincaré.jpg|link=Henri Poincaré (nonfiction)|1854: Mathematician, physicist, and engineer [[Henri Poincaré (nonfiction)|Henri Poincaré]] born. He will make many original fundamental contributions to pure and applied mathematics, mathematical physics, and celestial mechanics. |
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| ||1872 – Forest Ray Moulton, American astronomer and academic (d. 1952)
| | File:Harold_Urey.jpg|link=Harold Urey (nonfiction)|1893: Chemist and astronomer [[Harold Urey (nonfiction)|Harold Urey]] born. Urey's pioneering work on isotopes will earn him the Nobel Prize in Chemistry in 1934 for the discovery of deuterium; he will also play a significant role in the development of the atom bomb, and contribute to theories on the development of organic life from non-living matter. |
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| ||Paul Antoine Aristide Montel (b. 29 April 1876) was a French mathematician. He was born in Nice, France and died in Paris, France. He researched mostly on holomorphic functions in complex analysis. | |
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| ||1882 – Hendrik Nicolaas Werkman, Dutch printer, typographer, and Nazi resister (d. 1945) | |
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| ||James Victor Uspensky (b. April 29, 1883) was a Russian mathematician notable for writing ''Theory of Equations''. | |
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| ||1893 – Harold Urey, American chemist and astronomer, Nobel Prize laureate (d. 1981)
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| ||1894 – Marietta Blau, Austrian physicist and academic (d. 1970)
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| ||Giuseppe Battaglini (d. 29 April 1894) was an Italian mathematician.
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| ||1915 – Henry H. Barschall, German-American physicist and academic (d. 1997)
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| ||1916 – Jørgen Pedersen Gram, Danish mathematician and academic (b. 1850)
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| ||Ernest Fox Nichols (d. April 29, 1924) was an American educator and physicist. He served as the 10th President of Dartmouth College. Pic.
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| ||Walter Thirring (b. 29 April 1927) was an Austrian physicist after whom the Thirring model in quantum field theory is named.
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| ||Irving Fisher (d. April 29, 1947) was an American economist, statistician, inventor, and Progressive social campaigner. Fisher made important contributions to utility theory and general equilibrium. His research on the quantity theory of money inaugurated the school of macroeconomic thought known as monetarism. Fisher was also a pioneer of econometrics, including the development of index numbers.
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| ||1951 – Ludwig Wittgenstein, Austrian-English philosopher and academic...He worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.
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| ||1953 – The first U.S. experimental 3D television broadcast showed an episode of Space Patrol on Los Angeles ABC affiliate KECA-TV.
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| ||David Raymond Curtiss (d. April 29, 1953) was an American mathematician. He served as president of the Mathematical Association of America from 1935 to 1936.
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| ||1965 – Pakistan's Space and Upper Atmosphere Research Commission (SUPARCO) successfully launches its seventh rocket in its Rehber series.
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| ||1966 – William Eccles, English physicist and engineer (b. 1875)
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| ||1967 – After refusing induction into the United States Army the previous day, Muhammad Ali is stripped of his boxing title.
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| File:Nixon April-29-1974.jpg|link=Watergate scandal (nonfiction)|1974: [[Watergate scandal (nonfiction)|Watergate scandal]]: United States President Richard Nixon announces the release of edited transcripts of White House tape recordings relating to the scandal.
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| ||1975 – Vietnam War: Operation Frequent Wind: The U.S. begins to evacuate U.S. citizens from Saigon before an expected North Vietnamese takeover. U.S. involvement in the war comes to an end.
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| ||Charles Bradfield Morrey Jr. (d. 29 April 1984) was an American mathematician who made fundamental contributions to the calculus of variations and the theory of partial differential equations.
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| File:Ascleplius Myrmidon Halting Problem.jpg|link=On Halting Problems|1985: [[On Halting Problems|Asclepius Myrmidon discovers unregistered halting problem]], predicts imminent wave of [[crimes against mathematical constants]].
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| File:Chernobyl disaster.jpg|link=Chernobyl disaster (nonfiction)|1986: [[Chernobyl disaster (nonfiction)|Chernobyl disaster]]: American and European spy satellites capture the ruins of the 4th Reactor at the Chernobyl Power Plant. | | File:Chernobyl disaster.jpg|link=Chernobyl disaster (nonfiction)|1986: [[Chernobyl disaster (nonfiction)|Chernobyl disaster]]: American and European spy satellites capture the ruins of the 4th Reactor at the Chernobyl Power Plant. |
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| ||1992 – Los Angeles riots: Riots in Los Angeles, following the acquittal of police officers charged with excessive force in the beating of Rodney King. Over the next three days 63 people are killed and hundreds of buildings are destroyed. | | File:Albert Hoffman.jpg|link=Albert Hoffman (nonfiction)|2008: Chemist and academic [[Albert Hoffman (nonfiction)|Albert Hoffman]] dies. Hoffman is famous for discovering LSD, which he called his "problem child". |
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| ||Wilhelm Hanle (d. 29 April 1993) was a German experimental physicist. He is known for the Hanle effect. During World War II, he made contributions to the German nuclear energy project, also known as the Uranium Club. Pic.
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| ||1997 – The Chemical Weapons Convention of 1993 enters into force, outlawing the production, stockpiling and use of chemical weapons by its signatories.
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| ||2001 – Arthur B. C. Walker, Jr., American physicist and academic (b. 1936)
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| ||2005 – Louis Leithold, American mathematician and academic (b. 1924)
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| ||2008 – Albert Hofmann, Swiss chemist and academic (b. 1906)
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| ||2010 – Sandy Douglas, English computer scientist and academic, designed OXO (b. 1921)
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| ||2012 – Roland Moreno. French engineer, invented the smart card (b. 1945)
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| ||2013 – Ernest Michael, American mathematician and scholar (b. 1925)
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