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| File:Wilhelm_Schickard_1632.jpg|link=Wilhelm Schickard (nonfiction)|1592: Minister, scholar, astronomer, mathematician, cartographer, and inventor [[Wilhelm Schickard (nonfiction)|Wilhelm Schickard]] born. He will design and build calculating machines, and invent techniques for producing improved maps. | | File:Wilhelm_Schickard_1632.jpg|link=Wilhelm Schickard (nonfiction)|1592: Minister, scholar, astronomer, mathematician, cartographer, and inventor [[Wilhelm Schickard (nonfiction)|Wilhelm Schickard]] born. He will design and build calculating machines, and invent techniques for producing improved maps. |
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| ||1758 – Antoine de Jussieu, French botanist and physician (b. 1686)
| | File:J. Robert Oppenheimer.jpg|link=J. Robert Oppenheimer (nonfiction)|1904: American physicist and academic [[J. Robert Oppenheimer (nonfiction)|J. Robert Oppenheimer]] born. His achievements in physics will include the Born–Oppenheimer approximation for molecular wavefunctions, and the first prediction of quantum tunneling. Oppenheimer will be called the "father of the atomic bomb" for his role in the Manhattan Project. |
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| ||1778 – James Hargreaves, British inventor spinning jenny (b. 1720). No pic.
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| File:Richard_Trevithick.jpg|link=Richard Trevithick (nonfiction)|1833: Engineer and explorer [[Richard Trevithick (nonfiction)|Richard Trevithick]] dies. He was an early pioneer of steam-powered road and rail transport, developing the first high-pressure steam engine, and building the first full-scale working railway steam locomotive.
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| ||1864 – The U.S. Congress passes the Coinage Act of 1864 that mandates that the inscription In God We Trust be placed on all coins minted as United States currency.
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| ||Andrew Talcott (b. 1883) was an American civil engineer and close friend of Civil War General Robert E. Lee.
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| ||Harald August Bohr (b. 22 April 1887) was a Danish mathematician and soccer player. After receiving his doctorate in 1910, Bohr became an eminent mathematician, founding the field of almost periodic functions.
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| ||1891 – Vittorio Jano, Italian engineer (d. 1965)
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| ||1891 – Harold Jeffreys, English mathematician, geophysicist, and astronomer (d. 1989)
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| ||1891 – Nicola Sacco, Italian-American anarchist (d. 1927)
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| File:J. Robert Oppenheimer.jpg|link=J. Robert Oppenheimer (nonfiction)|1904: American physicist and academic [[J. Robert Oppenheimer (nonfiction)|J. Robert Oppenheimer]] born. His achievements in physics will include the Born–Oppenheimer approximation for molecular wavefunctions, and the first prediction of quantum tunneling. | |
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| ||Stanisław Jaśkowski (b. April 22, 1906) was a Polish logician who made important contributions to proof theory and formal semantics. Jaśkowski is considered to be one of the founders of natural deduction, which he discovered independently of Gerhard Gentzen in the 1930s.
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| ||Norman Earl Steenrod (b. April 22, 1910) was a mathematician most widely known for his contributions to the field of algebraic topology.
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| ||1915 – The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres.
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| ||1916 – Hanfried Lenz, German mathematician and academic (d. 2013)
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| ||1919 – Donald J. Cram, American chemist and academic, Nobel Prize laureate (d. 2001)
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| ||1922 – Wolf V. Vishniac, American microbiologist and academic (d. 1973)
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| ||1930 – The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
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| ||1933 – Anthony Llewellyn, Welsh-American chemist and astronaut (d. 2013)
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| ||Amir Pnueli (b. April 22, 1941) was an Israeli computer scientist and the 1996 Turing Award recipient. He worked on temporal logic and model checking, particularly regarding fairness properties of concurrent systems. Pic.
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| ||1944 – The 1st Air Commando Group using Sikorsky R-4 helicopters stage the first use of helicopters in combat with combat search and rescue operations in the China Burma India Theater.
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| ||1945 – Wilhelm Cauer, German mathematician and academic (b. 1900)
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| ||1954 – Red Scare: Witnesses begin testifying and live television coverage of the Army–McCarthy hearings begins.
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| File:Plutonium pellet.jpg|link=Plutonium (nonfiction)|1961: [[Plutonium (nonfiction)|Plutonium]] used for [[crimes against mathematical constants]], says [[Cantor Parabola]].
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| |File:The Hal Jordan Playbook.jpg|link=The Hal Jordan Playbook|1964: Publication of ''[[The Hal Jordan Playbook]]'' reveals new class of [[crimes against mathematical constants]].
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| Optical_fibers.jpg|link=Optical fiber (nonfiction)|1977: [[Optical fiber (nonfiction)|Optical fiber]] is first used to carry live telephone traffic.
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| ||1970 – The first Earth Day is celebrated.
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| ||1972 – Vietnam War: Increased American bombing in Vietnam prompts anti-war protests in Los Angeles, New York City, and San Francisco.
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| ||1977 – Optical fiber is first used to carry live telephone traffic.
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| ||1980 – Fritz Strassmann, German chemist and physicist (b. 1902)
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| ||1985 – Paul Hugh Emmett, American chemist and academic (b. 1900)
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| ||1988 – Grigori Kuzmin, Russian-Estonian astronomer and academic (b. 1917)
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| ||1989 – Emilio G. Segrè, Italian-American physicist and academic, Nobel Prize laureate (b. 1905)
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| ||1999 – Munir Ahmad Khan, Pakistani-Austrian physicist and engineer (b. 1926)
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| ||Victor Frederick "Viki" Weisskopf (d. April 22, 2002) was an Austrian-born American theoretical physicist. During World War II he was Group Leader of the Theoretical Division of the Manhattan Project at Los Alamos, and later campaigned against the proliferation of nuclear weapons. Pic.
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| ||2003 – James H. Critchfield, American CIA officer (b. 1917)
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| ||Philip Morrison (d. April 22, 2005) was a professor of physics at the Massachusetts Institute of Technology (MIT). He is known for his work on the Manhattan Project during World War II, and for his later work in quantum physics, nuclear physics and high energy astrophysics. Pic. | | File:J._R._Oppenheimer.jpg|link=J. R. Oppenheimer|1953: Singer-physicist [[J. R. Oppenheimer]] performs his hit song "Destroyer of Worlds" at the Grand Ole Opry, leading to his being summoned before the [[House Un-American Activities Committee (nonfiction)|House Un-American Activities Committee]]. |
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| File:Henriette_Avram.jpg|link=Henriette Avram (nonfiction)|2006: Computer scientist and academic [[Henriette Avram (nonfiction)|Henriette Avram]] dies. She developed the MARC (Machine Readable Cataloging) format, the international data standard for bibliographic and holdings information in libraries. | | File:McCarthy Cohn 1954.jpg|link=Army–McCarthy hearings (nonfiction)|1954: Red Scare: Witnesses begin testifying and live television coverage of the [[Army–McCarthy hearings (nonfiction)|Army–McCarthy]] hearings begins. |
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| ||Patrick Paul Billingsley (d. April 22, 2011) was an American mathematician and stage and screen actor, noted for his books in advanced probability theory and statistics. Pic. | | File:Earth Day Flag.png|link=Earth Day (nonfiction)|1970: The first [[Earth Day (nonfiction)|Earth Day]] is celebrated. |
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| ||2012 – George Rathmann, American chemist, biologist, and businessman (b. 1927) | | Optical_fibers.jpg|link=Optical fiber (nonfiction)|1978: [[Optical fiber (nonfiction)|Optical fiber]] is first used to carry live [[Telephone (nonfiction)|telephone]] traffic. |
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