Event:
Dr. Kent Brantly and Nancy Writebol, American aid workers who contracted the Ebola virus in Liberia and returned to the U.S. for treatment, have been released and declared fully recovered
More Notable Events on August 21: 1993 NASA loses contact with Mars Observer
1989 Voyager 2 begins a flyby of planet Neptune
1968 Democratic Convention opens in Chicago
1968 Warsaw Pact forces enter Czechoslovakia to end reform movement
1897 Oldsmobile begins operation as a General Motors Corp division
