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| File:Cornelis de Houtman.jpg|link=Cornelis de Houtman (nonfiction)|1565: Explorer [[Cornelis de Houtman (nonfiction)|Cornelis de Houtman]] born. He will discover a new sea route from Europe to Indonesia, beginning the Dutch spice trade. | | File:Francesco Maria Grimaldi.jpg|link=Francesco Maria Grimaldi (nonfiction)|1618: Mathematician and physicist [[Francesco Maria Grimaldi (nonfiction)|Francesco Maria Grimaldi]] born. Grimaldi, along with Riccioli, will investigate the free fall of objects, confirming that the distance of fall was proportional to the square of the time taken. |
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| File:Galileo Galilei.jpg|link=Galileo Galilei|1615: Mathematician, physicist, astronomer, and crime-fighter [[Galileo Galilei]] teams up with orbital artificial intelligence [[AESOP]] to stop [[Crimes against physical constants|crimes against the ionosphere]]. | | File:Jan Tschichold (1963) by Erling Mandelmann.jpg|link=Jan Tschichold (nonfiction)|1902: Graphic designer and typographer [[Jan Tschichold (nonfiction)|Jan Tschichold]] born. Tschichold will become a leading advocate of Modernist design, but later condemn Modernist design in general as being authoritarian and inherently fascistic. |
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| File:Francesco Maria Grimaldi.jpg|link=Francesco Maria Grimaldi (nonfiction)|1618: Mathematician and physicist [[Francesco Maria Grimaldi (nonfiction)|Francesco Maria Grimaldi]] born. Working with Riccioli, he will investigate the free fall of objects, confirming that the distance of fall was proportional to the square of the time taken. | | File:Donald_J._Hughes.png|link=Donald J. Hughes (nonfiction)|1915: Nuclear physicist [[Donald J. Hughes (nonfiction)|Donald J. Hughes]] born. Hughes will be one of the signers of the Franck Report in June, 1945, recommending that the United States not use the atomic bomb as a weapon to prompt the surrender of Japan in World War II. |
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| ||Moyse Charas (b. 2 April 1619), was an apothecary in France during the reign of Louis XIV. He became famous for publishing compendiums of medication formulas, which played vital roles in the development of modern pharmacy and chemistry. Pic. | | File:George Spencer-Brown.jpg|link=George Spencer-Brown (nonfiction)|1923: Polymath [[George Spencer-Brown (nonfiction)|George Spencer-Brown]] born. Spencer-Brown will write the unorthodox and influential ''Laws of Form'', calling it the "primary algebra" and the "calculus of indications". |
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| ||Mathieu Joseph Bonaventure Orfila (b. 24 April 1787) was a Menorcan-born French toxicologist and chemist, the founder of the science of toxicology. Pic.
| | File:1979_Sverdlovsk_anthrax_leak_-_map_of_patient_exposure.jpg|link=Sverdlovsk anthrax leak (nonfiction)|1979: A Soviet bio-warfare laboratory at Sverdlovsk [[Sverdlovsk anthrax leak (nonfiction)|accidentally releases airborne anthrax spores]], killing as many as a hundred people. Soviet authorities will cover up the event; all medical records of the victims will be removed in order to hide serious violations of the Biological Weapons Convention. |
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| ||1788 – Wilhelmine Reichard, German balloonist (d. 1848)
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| ||1814 – Erastus Brigham Bigelow, American inventor (d. 1879)
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| File:Samuel_Morse_1840.jpg|link=Samuel Morse (nonfiction)|1872: Painter and inventor [[Samuel Morse (nonfiction)|Samuel Morse]] dies. He co-invented the Morse code. | |
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| ||Antonio Signorini (b. 2 April 1888) was an influential Italian mathematical physicist and civil engineer of the 20th century. He is known for his work in finite elasticity, thermoelasticity and for formulating the Signorini problem. Pic.
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| ||Charles-Édouard Brown-Séquard FRS (d. 1894), also known as Charles Edward, was a Mauritian physiologist and neurologist who, in 1850, became the first to describe what is now called Brown-Séquard syndrome.
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| ||Chiungtze C. Tsen (b. April 2, 1898) was a Chinese mathematician born in Nanchang, Jiangxi, who proved Tsen's theorem. Pic.
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| ||1900 – The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
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| ||1902 – Dmitry Sipyagin, Minister of Interior of the Russian Empire, is assassinated in the Marie Palace, St Petersburg.
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| ||1902 – "Electric Theatre", the first full-time movie theater in the United States, opens in Los Angeles.
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| File:Jan Tschichold (1963) by Erling Mandelmann.jpg|link=Jan Tschichold (nonfiction)|1902: Graphic designer and typographer [[Jan Tschichold (nonfiction)|Jan Tschichold]] born. He will become a leading advocate of Modernist design, but later condemn Modernist design in general as being authoritarian and inherently fascistic.
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| ||Shokichi Iyanaga (b. April 2, 1906) was a Japanese mathematician.
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| ||1910 – Chico Xavier, Brazilian spiritual medium (d. 2002)
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| ||1911 – The Australian Bureau of Statistics conducts the country's first national census.
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| ||1912 – The ill-fated RMS Titanic begins sea trials.
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| ||Donald J. Hughes (b. April 2, 1915) was an American nuclear physicist, chiefly notable as one of the signers of the Franck Report in June, 1945, recommending that the United States not use the atomic bomb as a weapon to prompt the surrender of Japan in World War II. No Pic.
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| ||1917 – World War I: United States President Woodrow Wilson asks the U.S. Congress for a declaration of war on Germany.
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| File:Turbulent Head.png|link=Turbulent Head|1922: ''Turbulent Head'' awarded Newbery Medal for "best new children's book cover art."
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| File:George Spencer-Browne.jpg|link=George Spencer-Brown (nonfiction)|1923: Polymath [[George Spencer-Brown (nonfiction)|George Spencer-Brown]] born. He will write ''Laws of Form'', calling it the "primary algebra" and the "calculus of indications".
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| ||1928 – Theodore William Richards, American chemist and academic, Nobel Prize laureate (b. 1868)
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| ||1930 – After the mysterious death of Empress Zewditu, Haile Selassie is proclaimed emperor of Ethiopia.
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| ||1934 – Paul Cohen, American mathematician and theorist (d. 2007)
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| ||1956 – As the World Turns and The Edge of Night premiere on CBS-TV. The two soaps become the first daytime dramas to debut in the 30-minute format.
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| ||1972 – Actor Charlie Chaplin returns to the United States for the first time since being labeled a communist during the Red Scare in the early 1950s.
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| ||1973 – Launch of the LexisNexis computerized legal research service.
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| ||1972 – Actor Charlie Chaplin returns to the United States for the first time since being labeled a communist during the Red Scare in the early 1950s.
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| ||1973 – Launch of the LexisNexis computerized legal research service.
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| ||1975 – Vietnam War: Thousands of civilian refugees flee from Quảng Ngãi Province in front of advancing North Vietnamese troops.
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| ||1979 – A Soviet bio-warfare laboratory at Sverdlovsk accidentally releases airborne anthrax spores, killing 66 plus an unknown amount of livestock.
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| ||1980 – United States President Jimmy Carter signs the Crude Oil Windfall Profits Tax Act.
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| ||1989 – Soviet leader Mikhail Gorbachev arrives in Havana, Cuba, to meet with Fidel Castro in an attempt to mend strained relations.
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| ||1992 – In New York, Mafia boss John Gotti is convicted of murder and racketeering and is later sentenced to life in prison.
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| ||1995 – Hannes Alfvén, Swedish physicist and engineer, Nobel Prize laureate (b. 1908)
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| ||2002 – John R. Pierce, American engineer and author (b. 1910) TV radio sound
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| ||Robert Lawson Vaught (d. April 2, 2002) was a mathematical logician, and one of the founders of model theory. Pic.
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| ||2004 – John Argyris, Greek computer scientist, engineer, and academic (b. 1913)
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| ||2007 – Henry L. Giclas, American astronomer and academic (b. 1910)
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| ||2016 – Gallieno Ferri, Italian comic book artist and illustrator (b. 1929)
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