General Groves told Joseph Rotblat the real reason for the bomb in March 1944, and 42 years later a camera finally caught him saying it out loud. Almost no one has watched it. WGBH filmed it in 1986. The only scientist who ever quit the Manhattan Project sits in a cardigan with a page of notes, and undoes fifty years of official history in one sentence. One camera, one chair, and an interviewer who asked him to say it again — so he did. He opens with the date and the dinner table. Then he tells you what Groves said next. Watch him repeat the line the second time — flatter, quieter, like he's said it before and still isn't used to it. 1944: the only one of thousands at Los Alamos who walked out. 1945: Hiroshima happened without him. 1995: the Nobel Peace Prize, 51 years later. He spent 51 years warning the world about the bomb he refused to finish. This tape is the only place he says why he actually left.