I tell you what happened at our conference. Bohr gave this talk and somebody came to me toward the end of the talk- Better not discuss that in detail. It may have all kinds of funny consequences. And for some reason or other, we did not discuss it. But instead, one laboratory in Washington reproduced the fission experiment on that very same evening. And we saw the thing actually in action, a very remarkable discovery. I already talked to you about it. Fermi saw it. For years it was not understood. Eve the suggestion of this fission came up and Fermi disproved it. The point is that this fission cannot occur except in a way in which radioactivities emitting heavy particles occur according to Gamow. Heavy particles, relatively heavy particles have to go into regions where they are not supposed to be, according to classical mechanics; not enough energy. But in wave mechanics, they can do it. Well known to all of us. The suggestion was made to Fermi long before this conference and he calculated whether this could happen and found conclusively and clearly that it can not happen. The reason: the energy released in fission depends on measurements of energy. And energy is connected with mass, according to Einstein's E=mc?. The masses and therefore the energies have been measured. And it turned out not measured quite rightly. Measured years earlier by Aston. Fermi used slightly wrong energy figures and the little diss- difference in mass or energy makes a lot of difference in the possibility of fission. Here fission - that was suggested, discarded - had suddenly become a fact. And that fact was, of course, at the basis of everything that we now know about atomic energy, about atomic bombs.