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April 10 - Paul McCartney announces that the Beatles have disbanded, while at the same press conference, announcing the release of his new solo album.

April 11 - 74 people, mostly young boys, die as an avalanche buries a tuberculosis sanatorium in the French Alps.

April 11 - Apollo program: Apollo 13 (Jim Lovell, Fred Haise, Jack Swigert) is launched toward the Moon. On April 13, an oxygen tank in the spacecraft explodes, forcing the crew to abort the mission and return in 4 days.

April 16 - Rev. Ian Paisley won a by-election to the House of Commons of Northern Ireland.

April 16 - The National Westminster Bank begins trading in the United Kingdom.

April 17 - Safe return & splashdown of Apollo 13 (Apollo program).

April 21 - The Hutt River Province Principality secedes from Australia.

April 22 - The first Earth Day is celebrated in the U.S.

April 24 - China's first satellite (Dong Fang Hong 1) is launched to orbit using a Long March-1 Rocket (CZ-1).

April 29 - The U.S. invades Cambodia to hunt out the Viet Cong; massive antiwar protests occur in the U.S.