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On this day: August 20

POSTED: 12:46 AM PDT Aug 19, 2012 UPDATED: 11:00 PM PDT Aug 19, 2012

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 - Charles Darwin — 3 / 23

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1858: Charles Darwin first publishes his theory of evolution through natural selection in The Journal of the Proceedings of the Linnean Society of London, alongside Alfred Russel Wallace's same theory.

OTD August 20 - Presidio Tucson

OTD August 20 - Benjamin Harrison

OTD August 20 - Charles Darwin

OTD August 20 - Civil War

OTD August 20 - Tchaikovsky

OTD August 20 - NFL

OTD August 20 - Don King

OTD August 20 - Ron Paul

OTD August 20 - Lou Gehrig

OTD August 20 - Winston Churchill

OTD August 20 - Isaac Hayes

OTD August 20 - Tommy Brown

OTD August 20 - Robert Plant

OTD August 20 - Angie

OTD August 20 - Amy Adams

OTD August 20 - Viking 1

OTD August 20 - Voyager 2

OTD August 20 - post office shooting

OTD August 20 - Yellowstone fires

OTD August 20 - Demi Lovato

OTD August 20 - Sudan

OTD August 20 - Leona Helmsley

OTD July 20 - Pyllis Diller

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