Template:Are You Sure/April 11
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... that physicist and academic Ukichiro Nakaya (4 July 1900 – 11 April 1962) contributed to glaciology and low-temperature sciences, and that Nakaya created the first artificial snowflakes?
... that clockmaker Jean-André Lepaute (23 November 1720 – 11 April 1789) introduced numerous improvements in clockmaking, notably his pin-wheel escapement, and his clockworks in which the gears are all in the horizontal plane?