Appalling things can happen to children. And even a happy childhood is filled with sadnesses.

Humour and high seriousness... Perfect bedfellows, I think. Though I usually phrase it in terms of comedy and darkness. Comedy without darkness rapidly becomes trivial. And darkness without comedy rapidly becomes unbearable.

Most of my work consisted of crossing out. Crossing out was the secret of all good writing.

Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.

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.

And it's best if you know a good thing is going to happen, like an eclipse or getting a microscope for Christmas. And it's bad if you know a bad thing is going to happen, like having a filling or going to France. But I think it is worst if you don't know whether it is a good thing or a bad thing which is going to happen.

Every life is narrow. Our only escape is not to run away, but to learn to love the people we are and the world in which we find ourselves.