February 13

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  1787: Polymath Roger Joseph Boscovich dies. Boscovich was a physicist, astronomer, mathematician, philosopher, diplomat, poet, theologian, and Jesuit priest.

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  1805: Mathematician Peter Gustav Lejeune Dirichlet born. Dirichlet will important make contributions to number theory, analysis, and mechanics. He will also be one of the first mathematicians to give the modern formal definition of a function.

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  1910: Physicist and inventor William Shockley born. He will share the 1956 Nobel Prize in Physics for the invention of the point-contact transistor.

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  1926: Nuclear physicist Fay Ajzenberg-Selove born. She will do important experimental work in nuclear spectroscopy of light elements, authoring annual reviews of the energy levels of light atomic nuclei.

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  1956: Mathematician and philosopher Jan Łukasiewicz dies. Łukasiewicz' innovative thinking about the principle of non-contradiction and the law of excluded middle extended the bounds of traditional propositional logic.

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  1963: Discovery of Canopic Snickers an unlicensed transdimensional corporation which manifests itself as an ancient Egyptian candy bar with alleged life extension properties.

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  1992: Mathematician and physicist Nikolay Bogolyubov dies. His method of teaching, based on creation of a warm atmosphere, politeness, and kindness, is renowned in Russia as the "Bogolyubov approach".