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| File:Sunspots.jpg|link=Sunspot (nonfiction)|28 BC: A [[Sunspot (nonfiction)|sunspot]] is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China. | | File:Sunspots.jpg|link=Sunspot (nonfiction)|28 BC: A [[Sunspot (nonfiction)|sunspot]] is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China. |
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| File:Leonardo_da_Vinci_in_flight.jpg|link=Leonardo da Vinci|1480: Polymath and criminal investigator [[Leonardo da Vinci]] publicly accuses the [[House of Malevecchio]] of making secret treaties with the [[Forbidden Ratio]] gang and other [[Crimes against mathematical constants|criminal mathematical functions]].
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| File:Toscanelli.jpg|link=Paolo dal Pozzo Toscanelli (nonfiction)|1482: Mathematician and astronomer [[Paolo dal Pozzo Toscanelli (nonfiction)|Paolo dal Pozzo Toscanelli]] dies. Thanks to his long life, his intelligence and his wide interests, Toscanelli was one of the central figures in the intellectual and cultural history of Renaissance Florence in its early years. | | File:Toscanelli.jpg|link=Paolo dal Pozzo Toscanelli (nonfiction)|1482: Mathematician and astronomer [[Paolo dal Pozzo Toscanelli (nonfiction)|Paolo dal Pozzo Toscanelli]] dies. Thanks to his long life, his intelligence and his wide interests, Toscanelli was one of the central figures in the intellectual and cultural history of Renaissance Florence in its early years. |
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| ||1566: Leonhart Fuchs dies ... physician and botanist. Pic.
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| File:Matteo_Ricci.jpg|link=Matteo Ricci (nonfiction)|1600: Priest and mathematician [[Matteo Ricci (nonfiction)|Matteo Ricci]] publish his groundbreaking translation of ''Euclid's Elements'' into [[Gnomon algorithm]] statements.
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| ||1787: William Watson dies ... physician, physicist, and botanist. Pic.
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| ||1788: Augustin-Jean Fresnel born ... physicist and engineer. Pic.
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| ||1810: Friedrich Bessel became director of the new observatory at Konigsberg. In 1838 he will be the first to accurately measure the parallax of a star. Pic.
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| ||1821: Prince Baldassarre Boncompagni-Ludovisi born ... historian of mathematics and aristocrat. Pic.
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| ||1822: Paolo Ruffini dies ... mathematician and philosopher. Pic.
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| File:Thomas Young.jpg|link=Thomas Young (nonfiction)|1829: Polymath and physician [[Thomas Young (nonfiction)|Thomas Young]] dies. Young made notable scientific contributions to the fields of vision, light, solid mechanics, energy, physiology, language, musical harmony, and Egyptology. | | File:Thomas Young.jpg|link=Thomas Young (nonfiction)|1829: Polymath and physician [[Thomas Young (nonfiction)|Thomas Young]] dies. Young made notable scientific contributions to the fields of vision, light, solid mechanics, energy, physiology, language, musical harmony, and Egyptology. |
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| ||1830: François-Marie Raoult born ... chemist who conducted research into the behavior of solutions, especially their physical properties. Pic.
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| ||1847: Wilhelm Killing born ... mathematician and academic. Pic.
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| ||1849: Astor Place Riot: A riot breaks out at the Astor Opera House in Manhattan, New York City over a dispute between actors Edwin Forrest and William Charles Macready, killing at least 25 and injuring over 120.
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| ||1884: Charles Adolphe Wurtz dies ... chemist. He is best remembered for his decades-long advocacy for the atomic theory and for ideas about the structures of chemical compounds. Pic.
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| ||1891: Botanist Carl Wilhelm von Nägeli dies. He studied cell division and pollination but became known as the man who discouraged Gregor Mendel from further work on genetics. He rejected natural selection as a mechanism of evolution, favouring orthogenesis driven by a supposed "inner perfecting principle". Pic.
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| ||1899: Otakar Borůvka born ... mathematician best known today for his work in graph theory. Pic.
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| File:Cecilia Helena Payne-Gaposchkin.jpg|link=Cecilia Payne-Gaposchkin (nonfiction)|1900: Astronomer and astrophysicist [[Cecilia Payne-Gaposchkin (nonfiction)|Cecilia Payne-Gaposchkin]] born. Her doctoral thesis will establish that hydrogen is the overwhelming constituent of stars, and accordingly the most abundant element in the universe. | | File:Cecilia Helena Payne-Gaposchkin.jpg|link=Cecilia Payne-Gaposchkin (nonfiction)|1900: Astronomer and astrophysicist [[Cecilia Payne-Gaposchkin (nonfiction)|Cecilia Payne-Gaposchkin]] born. Her doctoral thesis will establish that hydrogen is the overwhelming constituent of stars, and accordingly the most abundant element in the universe. |
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| File:The Governess.jpg|link=The Governess|1900: Social activist and alleged superhero [[The Governess]] uses her power of Admonishment to stop would-be kidnappers from abducting the newborn [[Cecilia Payne-Gaposchkin (nonfiction)|Cecilia Payne-Gaposchkin]]. The kidnapping attempt is widely believed to be the work of the [[Forbidden Ratio]] gang.
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| ||1901: John Desmond Bernal born ... scientist who pioneered the use of X-ray crystallography in molecular biology. He published extensively on the history of science. In addition, Bernal was a political supporter of Communism and wrote popular books on science and society. Pic.
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| File:Abe Reles.jpg|link=Abe Reles (nonfiction)|1906: New York mobster and hit man [[Abe Reles (nonfiction)|Abe Reles]] born. A notorious killer, he will fall to his death in 1941 while under police custody, ostensibly a failed escape attempt but widely believed to be murder.
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| ||1910: Stanislao Cannizzaro dies ... chemist and academic ... he discovered that aromatic aldehydes are decomposed by an alcoholic solution of potassium hydroxide into a mixture of the corresponding acid and alcohol. For example, benzaldehyde decomposes into benzoic acid and benzyl alcohol, the Cannizzaro reaction. Pic.
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| ||1920: John Wesley Hyatt dies ... engineer. He simplied the production of celluloid, the first industrial plastic. Pic.
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| ||1924: J. Edgar Hoover is appointed first Director of the United States' Federal Bureau of Investigation (FBI), and remains so until his death in 1972. Pic.
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| ||1928: Lothar Schmid born ... chess player.
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| ||1933: Kurt Schütte, the last of Hilbert's 75 doctoral students, defended his dissertation on logic.
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| ||1933: Censorship: In Germany, the Nazis stage massive public book burnings.
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| ||1939: George Fix born ... mathematician who collaborated on several seminal papers and books in the field of finite element method. Pic.
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| ||1939: Franco Pacini born ... astrophysicist and academic. In 1967 he published in Nature the first specific suggestion that strongly magnetized neutron stars could release their rotational energy and produce a large flow of relativistic particles. The discovery of pulsars in Cambridge (UK) proved the correctness of his hypothesis a few months later by Jocelyn Bell Burnell and Antony Hewish of University of Cambridge. Pic.
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| ||1941: Diederik Johannes Korteweg dies ... mathematician. He is now best remembered for his work on the Korteweg–de Vries equation, together with Gustav de Vries. Pic.
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| ||1941: World War II: Rudolf Hess parachutes into Scotland to try to negotiate a peace deal between the United Kingdom and Nazi Germany.
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| ||1946: First successful launch of an American V-2 rocket at White Sands Proving Ground.
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| ||1957: Guido Ascoli dies ... mathematician, known for his contributions to the theory of partial differential equations, and for his works on the teaching of mathematics in secondary high schools. Pic.
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| File:The_Eel_v_Neptune_Slaughter.jpg|link=The Eel Fighting Neptune Slaughter|1960: Mathematician, art critic, and alleged time-traveller [[The Eel Fighting Neptune Slaughter|The Eel challenges aquatic cryptid and alleged supervillain Neptune Slaughter to single combat]], providing a distraction which enables the USS Triton to escape Slaughter's deadly mutant Cuttle-Net. | | File:The_Eel_v_Neptune_Slaughter.jpg|link=The Eel Fighting Neptune Slaughter|1960: Mathematician, art critic, and alleged time-traveller [[The Eel Fighting Neptune Slaughter|The Eel challenges aquatic cryptid and alleged supervillain Neptune Slaughter to single combat]], providing a distraction which enables the USS Triton to escape Slaughter's deadly mutant Cuttle-Net. |
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| File:Operation Sandblast track.jpg|link=Operation Sandblast (nonfiction)|1960: The nuclear submarine USS Triton completes [[Operation Sandblast (nonfiction)|Operation Sandblast]], the first underwater circumnavigation of the earth. | | File:Operation Sandblast track.jpg|link=Operation Sandblast (nonfiction)|1960: The nuclear submarine USS Triton completes [[Operation Sandblast (nonfiction)|Operation Sandblast]], the first underwater circumnavigation of the earth. |
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| ||1977: Dounreay nuclear reactor, Scotland: A 65 metre deep shaft at the plant was packed with radioactive waste and at least 2 kg of sodium and potassium. On 10 May 1977 seawater, which flooded the shaft, reacted violently with the sodium and potassium, throwing off the massive steel and concrete lids of the shaft. This explosion littered the area with radioactive particles.
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| ||1989: Hassler Whitney dies ... mathematician. He was one of the founders of singularity theory, and did foundational work in manifolds, embeddings, immersions, characteristic classes, and geometric integration theory. Pic.
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| ||1992: K. G. Ramanathan dies ... mathematician.
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| ||2002: FBI agent Robert Hanssen is sentenced to life imprisonment without the possibility of parole for selling United States secrets to Russia for $1.4 million in cash and diamonds.
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| ||2008: Dr John Paul Wild dies ... scientist. In the 1950s and 1960s he made discoveries based on radio observations of the Sun. In the late 1960s and early 1970s his team built and operated the world's first solar radio-spectrographs and subsequently the Culgoora radio-heliograph. Pic.
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| |link=|2009: Carol Jo Crannell dies ... a solar physicist known for her work on solar flares and on the astrophysical observation of x-rays and gamma rays. Pic: https://ggstem.wordpress.com/2013/02/19/carol-jo-crannell/
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| ||2017: Gaisi Takeuti dies ... mathematician, known for his work in proof theory. His goal was to prove the consistency of the real numbers. To this end, Takeuti's conjecture speculates that a sequent formalisation of second-order logic has cut-elimination. Pic search: https://www.google.com/search?q=Gaisi+Takeuti
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| File:Green Tangle 4.jpg|link=Green Tangle 4 (nonfiction)|2018: Durng a routine review of steganographic botany, ''[[Green Tangle 4 (nonfiction)|Green Tangle 4]]'' is unexpectedly reveals "at least two hundred and fifty six, perhaps five hundred and twelve" previously unknown shades of the color [[Green (nonfiction)|green]].
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| File:What people want, mainly (John Brunner, The Jagged Orbit).jpg|link=John Brunner on what people want, mainly (nonfiction)|2020: John Brunner observation on [[John Brunner on what people want, mainly (nonfiction)|what people want, mainly]] is voted Rebuke of the Day by the citizens of [[New Minneapolis, Canada]]
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