I mean we're all, I'm sure, basically family with what Darwin's theory of evolution is, and I don't really want to labour you by reminding you of it, but I think it's important to appreciate first of all what his problem was erm and I think that it's fair to say that for Darwin the problem was that as a naturalist he was aware of the fact that animals and plants are adapted to a quite extraordinary degree to their particular ways of life, and indeed many of his books on orchids and earthworms and so on have a great deal to say about the details of these adaptations.