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This Day In Hiytory
RAF
UK prime minister Winston Churchill saluted his country's air force with the statement, ''Never in the field of human conflict was so much owed by so many to so few" (1940)
Prague Spring
brief period of political liberalization in Czechoslovakia ended when the country was invaded by Warsaw Pact troops and tanks (1968)
Voyager 2
space probe left Earth to tour Jupiter, Saturn, Uranus and Neptune; it continues to transmit data as it leaves the solar system (1977)