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On This Day in History: 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.

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

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  1882: Large herd of Flying bison (Bison pterobonasus) swarms from Saint Paul, Minnesota to New Minneapolis, Canada.

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

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  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.

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  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.