Right okay so that's why it's important that we get I mean if we just got one neutron out then theoretically you could sustain a chain reaction, but in practice it would be absorbed, it wouldn't they wouldn't all hit, some of them would miss, but as long as we can get on average about one, of those three, hitting another one, we can keep it going, and we get this chain reaction going and th the heat really builds up then, and that's what they use in a a nuclear reaction reactor.