NATIONAL ARCHIVES / SCIENCE PHOTO LIBRARY NATIONAL ARCHIVES / SCIENCE PHOTO LIBRARY
Major General Leslie R. Groves studying a map of Japan. Groves was head of the Manhattan Project, the American programme to develop and build the first atomic bomb during World War Two. The project, which cost 2000 million dollars, was undertaken by the U.S. War Department and correlated the work of a multinational team of engineers and scientists. They worked under conditions of strictest secrecy from 1943 to 1945 at a remote makeshift laboratory in Los Alamos, New Mexico. Two atom bombs, each with a yield equivalent to 20,000 tonnes of high explosive, were dropped over Japan during August 1945. The Japanese surrendered shortly afterwards.
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