On August 22, 1939, Einstein wrote a letter to President Franklin D. Roosevelt, explaining that it might be possible to build an atomic bomb. Einstein asked the President to provide governmental help for the study of the release of nuclear energy. Einstein also warned him that Nazi Germany might already be trying to build an atomic bomb. His letter helped set the United States on the long, difficult and rather costly path that led to the production of an atomic bomb. The same which was dropped on Hiroshima and Nagasaki and caused irreparable damages to generations living in those two places
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