Template:Selected anniversaries/May 6

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  1840: The Penny Black postage stamp becomes valid for use in the United Kingdom of Great Britain and Ireland.

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  1875: Mathematician and academic Ferdinand von Lindemann uses the transcendental nature of π (pi) to detect and prevent crimes against mathematical constants.

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  1895: Mathematician and academic Júlio César de Mello e Souza born. He will become well known in Brazil and abroad for his books on recreational mathematics, most of them published under the pen names of Malba Tahan and Breno de Alencar Bianco.

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  1936: Mathematician and academic Aleksandr Khinchin uses new theory of probability based on Gnomon algorithm functions to detect and prevent crimes against mathematical constants.

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  1937: Hindenburg disaster: The German zeppelin Hindenburg catches fire and is destroyed within a minute while attempting to dock at Lakehurst, New Jersey. Thirty-six people are killed.

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  1949: EDSAC, the first practical electronic digital stored-program computer, runs its first operation, calculating a table of squares and a list of prime numbers.

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  1974: Information management specialist and alleged crime boss Baron Zersetzung donates several hundred terabytes of recycled Extract of Radium to food shelves and internet cafes across the United States.