Template:Selected anniversaries/April 19

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  • 1567: Mathematician, monk, and academic Michael Stifel dies. Stifel was an Augustinian who became an early supporter of Martin Luther.

    1567: Mathematician, monk, and academic Michael Stifel dies. Stifel was an Augustinian who became an early supporter of Martin Luther.

  • 1860: On his phonautograph machine, Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.

    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. Peterson discovered equations which were subsequently named the Gauss–Codazzi equations, fundamental to the theory of embedded hypersurfaces in a Euclidean space.

    1881: Mathematician Karl Mikhailovich Peterson dies. Peterson 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.

    1882: Large herd of Flying bison (Bison pterobonasus) migrates from Periphery to New Minneapolis, Canada.

  • 1897: Physicist, academic, and APTO field engineer Karl Ferdinand Braun invents a new type of cathode ray tube oscilloscope which uses Gnomon algorithm functions to emulate a primitive Scrying engine.

    1897: Physicist, academic, and APTO field engineer Karl Ferdinand Braun invents a new type of cathode ray tube oscilloscope which uses Gnomon algorithm functions to emulate a primitive Scrying engine.

  • 1912: Chemist Glenn T. Seaborg born. Seaborg will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements.

    1912: Chemist Glenn T. Seaborg born. Seaborg will share the 1951 Nobel Prize in Chemistry for the synthesis, discovery, and investigation of transuranium elements.

  • 1914: Mathematician and philosopher Charles Sanders Peirce dies. Peirce is remembered as "the father of pragmatism".

    1914: Mathematician and philosopher Charles Sanders Peirce dies. Peirce is remembered as "the father of pragmatism".

  • 1932: Mathematician Giuseppe Peano publishes new class of Gnomon algorithm functions which use axiomatic set theory to detect and prevent crimes against mathematical constants.

    1932: Mathematician Giuseppe Peano publishes new class of Gnomon algorithm functions which use axiomatic 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: 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. Kohn developed density functional theory, which makes it possible to calculate quantum mechanical electronic structure by equations involving the electronic density.

    2016: Theoretical physicist, theoretical chemist, and Nobel laureate Walter Kohn dies. Kohn developed density functional theory, which makes it possible to calculate quantum mechanical electronic structure by equations involving the electronic density.

  • 2019: The Minicon 54 Great Nerd Giveaway begins. By the end of Minicon 54, hundreds of nerd items will have found new homes, generating an abundance of fun in the process.

    2019: The Minicon 54 Great Nerd Giveaway begins. By the end of Minicon 54, hundreds of nerd items will have found new homes, generating an abundance of fun in the process.

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