The other big influence in my childhood before I became a scientist, but obviously made me a scientist in the end, was science fiction. I read Wells, I read a man called Stapledon, who people don't read nowadays... wrote an extraordinary book called Last and First Men, in about 1932 or something, which has an atom bomb, it has a... the oil crisis destroying civilisation, it has giant brains, it has the breeding of new human beings who will be able to build civilisation and so on. And I remember reading this book and getting fascinated by genetics, because it's full of the idea of how do you change human nature by genetic means. And I guess, ultimately, that's why I became a geneticist. But there's a twist to the story, which I feel I ought to get on record, that I... much later, oh, quite recently, I was reading a set of short stories by Arthur C Clarke. And in this... there's an introduction by Clarke about his own childhood, and he describes how he read this book... this same book and how it blew his mind - he's a couple of years older than me, by the way - and how he... it made him a science fiction writer. But the fascinating thing is that he got it out of the local public library, and so did I. We got it out of the same public library, we got it out of the local public library in Minehead, in Somerset. And I thought, now, whichever librarian put that book on the shelf, you know, he's got a lot to answer for. But science fiction had a big influence of introducing me to science.