Leaving England was a painful decision, and we still have some regrets about it. However, at that time, the research environment for theoretical chemistry was clearly better in the U.S.

Looking through the list of earlier Nobel laureates, I note a large number with whom I became acquainted and with whom I interacted during those years as they passed through Cambridge.

I was a close observer of the developments in molecular biology.

At the age of 12, I developed an intense interest in mathematics. On exposure to algebra, I was fascinated by simultaneous equations and read ahead of the class to the end of the book.

From an early age I was told that I was expected to do more than continue to run a small business. Education was important and seen as a way of moving forward.

I am delighted to have had students, friends and colleagues in so many nations and to have learned so much of what I know from them. This Nobel Award honours them all.

On my return to Pittsburgh, I resolved to go back to the fundamental problems of electronic structure that I had contemplated abstractly many years earlier.

I had changed from being a mathematician to a practicing scientist. I was increasingly embarassed that I could no longer follow some of the more modern branches of pure mathematics.

Life with a scientist who is often changing jobs and is frequently away at meetings and on lecture tours is not easy. Without a secure home base, I could not have made much progress.

In the war, most young men were inducted into the armed forces at the age of 17. A group of students was permitted to attend university before taking part in wartime research projects.

Our children were mostly brought up and educated in the Churchill suburb east of Pittsburgh. Each summer, we took them back to England for an extended period.

I am not rich, but I am wealthy and my wealth is my love.

You flourish one hushed breath at a time. Imagine all you can build word by single word.

Cooking is like love. It should be entered into with abandon or not at all.

People who know me, they know I have a sense of humor, I'm a bit of a joker, a bit of a clown really, and I would love someone to exploit that side of me and send me a romantic comedy.

Writing about magic is harder than writing about spies because you're dealing with something that doesn't really exist.

I think I was always an old soul, even as a teenager.

We're in an era in which we want to believe people have roughly equal potential. IQ gives the lie to that.

Our mind is like a fog; even a moderate wind disperses it easily.

A smile can change the situation of the world.

All through my career I've done what I can to discover new talent and give them a start.