…the features. But I'll show you the kind of reasoning that was used. It had to do with the discovery by Delmann and Nishijima of the idea of a new concept of strangeness and the idea that in strong interactions are easy to produce reactions among, easy…

…what they call the strongly interacting particles. There was a law of conservation of strangeness. And this was proposed by Nishijima and Gelman. And when Gelman, working with Peiss, was analyzing the consequences of this more carefully, he came across a…