Sometimes you need things rather than just thoughts.

I'm a long distance runner, and I get my best ideas when I'm out running. It also helps that I can't write it down immediately - if you hold onto an idea, other things will stick on it.

I try to avoid describing one interpretation of my books. Of course I have an opinion. I have things I want to say, but I don't ever want to limit anybody, to have them say, 'Oh, he said this, so that's what it's about.' I'm happy people bring their own stuff to it.

In some ways. I always feel between worlds, between cultures, and I think that's not necessarily a bad place for a writer to be. Writers are kind of on the fringe anyway, observing, writing things down. I'm still mostly American, but it's a nice tension.

I got tired of books where the boy is a bit thick and the girl's very clever. Why does it have to such an opposition? Why can't they be like the girls and boys that I know personally, who are equally funny and equally cross? Who get things equally wrong and are equally brave? And make the same mistakes?

Plot is a framework on which to drape other things. So once that's working, I can just let it go and do all the stuff that I love - 'Trojan horse' it. There are so many great YA heroines, and that's fantastic, but what about the emotionally complex boy out there? That's who I tend to write about.