Duration: 42.4s

Then we'll get not kilotons, but megatons. FEYNMAN: A big fission reaction... Okay, hang on, hang on. So how do you generate enough force to fuse hydrogen atoms? A small fission bomb. FEYNMAN: There we are. - (laughter) - (scattered applause) Well, since we're going to need one anyway, can we get back to the business at hand? SENATOR BARTLETT: The isotopes issue wasn't your most important policy disagreement with Dr. Oppenheimer. It was the hydrogen bomb, wasn't it? Uh, as colleagues, we agreed to disagree on a great many things, uh, and, well, one of them was the need for an H-bomb program, yes. - (siren wailing) - (uneasy music playing)