I read very, very little fiction as a kid. All the books I can remember are junior science books.

I thought Bill Bryson's A Short History of Nearly Everything was remarkable. Managing to be entertaining while still delivering all that hard science was a pretty good trick to pull off.

I think people believe in heaven because they don't like the idea of dying, because they want to carry on living and they don't like the idea that other people will move into their house and put their things into the rubbish.

And because there is something they can’t see people think it has to be special, because people always think there is something special about what they can’t see, like the dark side of the moon, or the other side of a black hole, or in the dark when they wake up at night and they’re scared.

I have very fond memories of swimming in Walden Pond when we lived in Boston. You'd swim past a log and see all these turtles sunning themselves. Slightly disturbing if you thought about how many more were swimming around your toes, but also rather wonderful.

You love someone, you've got to let something go.

When I was writing for children, I was writing genre fiction. It was like making a good chair. However beautiful it looked, it needed four legs of the same length, it had to be the right height and it had to be comfortable.