For the first time in recorded history, Niagara Falls stopped flowing. An ice jam in the Niagara River above the rim of the falls caused the water to stop.
Julius and Ethel Rosenberg were found guilty of passing atomic secrets to the Russians and were sentenced to death.
Lt. William Calley was convicted of murdering 22 Vietnamese civilians in the My Lai massacre.
The last U.S. troops left South Vietnam.
The Dow Jones industrial average closed above 10,000 for the first time, at 10,006.78.