In novels in general - and also on the television - we do live in a world where bodies is what we are. We do not talk about the spirit or the soul, and there is a sense that we no longer talk about beliefs, either Freudian or Marxist.
I always say I write my own novels and the characters don't take control of me, but in fact, I look at the characters in the early stages and I think, 'What is he or she like,' and they slowly come together and they become the person they are.
I find the attempt to find things out, which scientists are possessed by, to be as human as breathing, or feeding, or sex. And so the science has to be in the novels as science and not just as metaphors.