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.