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1 day ago · The Manhattan Project was a secretive program to create the first atomic bombs during World War II, led by the United States with the UK and Canada. It involved thousands of scientists, engineers, and workers at over 30 sites, and resulted in two types of bombs, uranium and plutonium, that were used against Japan in 1945.
1 day ago · Pennsylvania is a state in the northeastern United States with a rich and diverse history, culture, and natural features. Learn about its colonial origins, role in the American Revolution and Civil War, geography, population, state symbols, and more.
