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 - Yellowstone fires
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National Park Service

1988: Firefighting continues in Yellowstone National Park, with the fires burning so much ground and producing such thick black smoke that the day is labeled "Black Saturday."

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