On this day: February 21

Published: Feb 21 2013 12:46:53 AM EST   Updated On: Feb 21 2015 02:00:00 AM EST

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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    The guillotine is first used, American and Soviet troops cut Nazi Germany in two, a U.S. Navy submarine completes the first submerged circumnavigation of the globe, and the Hubble Space Telescope is launched, all on this day.