It is the 21st day of the year and there are only 344 days remaining.
1525 - The Swiss Anabaptist Movement is founded when Conrad Grebel, Felix Manz, George Blaurock, and about a dozen others baptize each other in the home of Manz's mother in Zurich. This breaks a thousand-year tradition of church-state union.
1793 - After being found guilty of treason by the French Convention, Louis XVI is executed by guillotine.
1861 - Jefferson Davis resigns from the United States Senate.
1899 - Opel manufactures its first automobile.
1911 - The first Monte Carlo Rally takes place.
1950 - Alger Hiss is convicted of perjury.
1954 - The first nuclear-powered submarine, the USS Nautilus, is launched in Groton, Connecticut by Mamie Eisenhower, First Lady of the United States.
1960 - Little Joe 1B, a Mercury spacecraft, lifts off from Wallops Island, Virginia with Miss Sam, a female rhesus monkey on board.
1968 - The Battle of Khe Sanh begins, as one of the most publicized and controversial battles of the Vietnam War.
1968 - A B-52 bomber crashes near Thule Air Base, contaminating the area after its nuclear payload ruptures. One of the four bombs remains unaccounted for after the cleanup operation is complete.
1977 - President Jimmy Carter pardons nearly all American Vietnam Wat draft evaders.
1981 - Production of the iconic DeLorean DMC-12 sports car begins in Dunmurry, Northern Ireland.
1997 - Newt Gingrich becomes the first leader of the United States House of Representatives to be internally disciplined for ethical misconduct.
1999 - In one of the largest drug busts in American history, the United States Coast Guard intercepts a ship with over 4,300 kilograms or 9,500 pounds of cocaine on board.