Charles Darwin publishes his theory of evolution, the NFL is founded, Lou Gehrig belts his 23rd career grand slam and NASA heads for Mars, all on this day.
1940: In Mexico City, exiled Russian revolutionary Leon Trotsky is fatally wounded with an ice axe by Spanish-born Soviet agent Ramón Mercader on the orders of Joseph Stalin. He would die the next day.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
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