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(Reuters) - The atomic bomb the United States dropped on Hiroshima on Aug. 6, 1945 killed tens of thousands and flattened the Japanese city in an instant. FILE PHOTO: Smoke billows 20,000 feet (6,100 metres) after an atomic bomb codenamed "Little Boy" exploded after being dropped by a U.S. Army Air Force B-29 bomber named Enola Gay over Hiroshima, Japan August 6, 1945. U.S. Army Air Forces/Library of Congress/Handout via REUTERS/File Photo. “Little Boy,” as it was known, was the endpoint of years of research, wrangling a physics theory into a mechanism that would release the energy that binds together atoms. The concept was simple: driving together enough uranium or plutonium at high enoug... Full story

4 August