On this day: February 21

POSTED: 10:46 PM MST Feb 20, 2013    UPDATED: 12:00 AM MST Feb 21, 2013 
Malcolm X, 1964, Library of Congress

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.