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.
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.
U.S. National Archives
Dutch National Archives
Joe Raedle/Getty Images
Neilson Barnard/Getty Images for TIME Inc.
Frederick M. Brown/Getty Images
National Archives and Records Administration
Ethan Miller/Getty Images for BT PR; Justin Sullivan/Getty Images
Rankin Bass via Wikimedia Commons
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