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July 25
1946The United States tested the first underwater atomic bomb at Bikini Atoll. 1952Puerto Rico became a commonwealth of the United States. 1956The Italian liner Andrea Doria sank after colliding with the Swedish ship Stockholm off the New England coast, killing 51 people. 1978The world's first test-tube baby, Louise Joy Brown, was born in Lancashire, England. 1984Soviet cosmonaut Svetlana Savitskaya became the first woman to walk in space. 2000The supersonic airliner Concorde crashed after takeoff outside Paris. 
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