October 30

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  1626: Astronomer and mathematician Willebrord Snellius dies. In 1615 he conducted a large-scale experiment to measure the circumference of the earth using triangulation, underestimating the circumference of the earth by 3.5%.

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  1878: Electrical engineer and inventor Arthur Scherbius born. He will invent and patent the famous mechanical cipher Enigma machine.

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  1925: Engineer and inventor John Logie Baird creates Britain's first television transmitter.

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  2008: Mathematician, social activist, and crime-fighter Irving Adler publishes evidence that high-level crimes against mathematical constants have been covered up by the government for decades.

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  2009: Anthropologist and ethnologist Claude Lévi-Strauss dies. His work was key in the development of the theory of structuralism and structural anthropology.