On this day: August 20

Published On: Aug 19 2012 02:46:11 AM CDT   Updated On: Aug 20 2013 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 - Lou Gehrig
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Library of Congress

1938: Lou Gehrig of the New York Yankees hits his 23rd career grand slam, setting a major-leage baseball record that still stands today. However, fellow Yankees slugger Alex Rodriguez tied the mark on June 12, 2012.

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