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.
1775: The Spanish establish the Presidio San Augustin del Tucson in the town that will become Tucson, Ariz.
Keystone Resort/Ben Lindbloom
SRI International via Wikimedia Commons
Jessica Rinaldi / Reuters
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