Transcription: Just a few weeks later, Hitler's army invaded Poland and World War II had begun. Roosevelt ignored Einstein's plea until there was strong evidence that the Germans were working on nuclear weapons. This evidence prompted Roosevelt to authorize the Manhattan Project in 1943, a two billion dollar top-secret effort to develop an atomic bomb. Security on the Manhattan Project was so tight that even Vice President Truman knew nothing of it, and only a handful of people among the thousands involved in the Manhattan Project knew what they were attempting thing to build. Following the Normandy invasion ...
(.mp3)