On August 20, 1940, British Prime Minister Winston Churchill paid tribute to the Royal Air Force, saying, ''Never in the field of human conflict was so much owed by so many to so few.''
On August 20 1953, the Soviet Union publicly acknowledged it had tested a hydrogen bomb.
On August 20, 1968, the Soviet Union and other Warsaw Pact nations invaded Czechoslovakia to crush the ''Prague Spring'' liberalization drive of Alexander Dubcek's regime.
On August 20, 1977, the United States launched Voyager 2, an unmanned spacecraft carrying a 12-inch copper phonograph record containing greetings in dozens of languages, samples of music and sounds of nature.
On August 20 1953, the Soviet Union publicly acknowledged it had tested a hydrogen bomb.
On August 20, 1968, the Soviet Union and other Warsaw Pact nations invaded Czechoslovakia to crush the ''Prague Spring'' liberalization drive of Alexander Dubcek's regime.
On August 20, 1977, the United States launched Voyager 2, an unmanned spacecraft carrying a 12-inch copper phonograph record containing greetings in dozens of languages, samples of music and sounds of nature.
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