You've had a film adaptation already of Northern Lights, the first of the His Dark Materials trilogy. There's now a BBC series of the trilogy being made. How do you feel about adaptations of your books and what do they do to your voice? Do you hand it over? Well, you have to, yes. It doesn't do anything to the book. If there was a law that said whenever there's an adaptation made of a novel, the novel had to be withdrawn, burnt. But of course the book is still available. I'm very taken by an idea of the American neuroscientist David Eagleman, which he calls possibility-anism. More things are possible than we think