Template:Selected anniversaries/April 19: Difference between revisions
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||1981: The U.S. Navy nuclear submarine USS George Washington accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it. | ||1981: The U.S. Navy nuclear submarine USS George Washington accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it. | ||
||2007: Dorrit Hoffleit dies ... astronomer and academic | ||2007: Dorrit Hoffleit dies ... astronomer and academic. Pic. | ||
|| | ||2013: Kenneth Ira Appel dies ... mathematician who in 1976, with colleague Wolfgang Haken at the University of Illinois at Urbana-Champaign, solved one of the most famous problems in mathematics, the four-color theorem. They proved that any two-dimensional map, with certain limitations, can be filled in with four colors without any adjacent "countries" sharing the same color. Pic: http://www.kindertransporte-nrw.eu/appel/appel_work_1_e.html | ||
||2016: Duane Clarridge dies ... American spy | ||2015: Alexander Dalgarno dies ... physicist and academic. Dalgarno's research covered three main areas: theoretical atomic and molecular physics, astrophysics and aeronomy (the study of the upper atmosphere). Known as the "father of molecular astrophysics." Pic. | ||
||2016: Duane Clarridge dies ... American spy. Pix not Wiki. | |||
File:Violet Spiral.jpg|link=Violet Spiral (nonfiction)|2016: Chromatographic analysis of ''[[Violet Spiral (nonfiction)|Violet Spiral]]'' reveals "at least two, probably three" previously unknown shades of [[Violet (nonfiction)|violet]]. | File:Violet Spiral.jpg|link=Violet Spiral (nonfiction)|2016: Chromatographic analysis of ''[[Violet Spiral (nonfiction)|Violet Spiral]]'' reveals "at least two, probably three" previously unknown shades of [[Violet (nonfiction)|violet]]. | ||
Revision as of 12:41, 7 December 2018
1860: On his phonautograph machine, Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.
1881: Mathematician Karl Mikhailovich Peterson dies. He discovered equations which were subsequently named the Gauss–Codazzi equations, fundamental to the theory of embedded hypersurfaces in a Euclidean space.
1882: Large herd of Flying bison (Bison pterobonasus) migrates from Periphery to New Minneapolis, Canada.
1912: Chemist Glenn T. Seaborg born. He will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements.
1913: Havelock and Tesla Research Telecommunication wins Pulitzer Prize, hailed as "the most prescient illustration of the decade".
1914: Mathematician and philosopher Charles Sanders Peirce dies. He is remembered as "the father of pragmatism".
1932: Mathematician Giuseppe Peano publishes new class of Gnomon algorithm functions which use set theory to detect and prevent crimes against mathematical constants.
2016: Chromatographic analysis of Violet Spiral reveals "at least two, probably three" previously unknown shades of violet.
2016: Theoretical physicist, theoretical chemist, and Nobel laureate Walter Kohn dies. He developed density functional theory, which makes it possible to calculate quantum mechanical electronic structure by equations involving the electronic density.