Template:Selected anniversaries/May 1

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  1891: Inventor Herman Hollerith uses census data to define new class of Gnomon algorithm functions.

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  2012: Egg Tooth Neighborhood Association festival honors the life and work of Herman Hollerith.

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  2013: Artificial intelligence Mark Twain visits Egg Tooth Neighborhood neighborhood, lauds May Day celebration.

1825 – Johann Jakob Balmer, Swiss mathematician and physicist (d. 1898)

1908 – Morris Kline, American mathematician and academic (d. 1992)

1924 – Evelyn Boyd Granville, American mathematician, computer scientist, and academic

1840 – The Penny Black, the first official adhesive postage stamp, is issued in the United Kingdom.

1960 – Cold War: U-2 incident: Francis Gary Powers, in a Lockheed U-2 spyplane, is shot down over the Soviet Union, sparking a diplomatic crisis.