On this day: August 20

Published On: Aug 19 2012 02:46:11 AM CDT   Updated On: Aug 20 2016 01:00:00 AM CDT

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.

OTD August 20 - post office shooting
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1986: In Edmond, Oklahoma, U.S. Postal employee Patrick Sherrill shoots 20 of his co-workers, killing 14 of them, and then commits suicide. The incident is credited with inspiring the American phrase "going postal." Pictured here is a memorial at the site of the shooting.

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