His big hobby, almost, a subject which he kept coming back to during his- the whole of his life, was the scientific method. I do remember he talked to the- there were all these societies around and he talked to the- the Science Society or the Biology Society. I think it's probably called the Science Society, about the scientific method, and he told us about the creation of hypotheses. It was all rather- we- in retrospect, it was very much Popperish. But he was friend of Popper's, and I don't quite know if all the trade was from Popper to Peter or if there was something perhaps going the other way. The creation of hypotheses, the act of creation, and then the- the testing, the establishment of theory, and then the relationship between theory and meta-theory. I thought that was lovely. That absolutely confirmed one wanting to be a scientist.