On this day: February 21

Posted: 12:46 AM EST Feb 21, 2013   Updated: 2:00 AM EST Feb 21, 2016

The Washington Monument is dedicated, Alka-Seltzer is sold for the first time, the peace symbol is born, Malcolm X is assassinated, and Nixon heads to China, all on this day.

OTD February 21 - David Letterman
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CBS Television

2000: David Letterman returns to the late-night talk show "Late Show with David Letterman" about five weeks after having an emergency quintuple heart bypass operation. Letterman brought all but one of the doctors and nurses on stage who had participated in his surgery and recovery to tearfully thank them.

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