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