But what is the past? Could it be, the firmness of the past is just illusion? Could the past be a kaleidoscope, a pattern of images that shift with each disturbance of a sudden breeze, a laugh, a thought? And if the shift is everywhere, how would we know?

When I used to play golf. It's a terrible miserable game. It's incredibly frustrating. In 18 holes you make 150 horrible shots off in the woods, in the water...You make one good shot and it brings you back the next time. With writing a long book there has to be at least one bit that has some magic in it that you can go back to.

Each person who gets stuck in time gets stuck alone.

I consider myself an essayist and a fiction writer. In the essays, I certainly have been influenced by some of the leading science essayists. Like Loren Eiseley, Stephen Jay Gould, Lewis Thomas.

I have too many friends who tell me that they spend the first hour of every morning going through their e-mail messages. I'd like to use my time more carefully.

As both a scientist and a humanist myself, I have struggled to understand different claims to knowledge, and I have eventually come to a formulation of the kind of religious belief that would, in my view, be compatible with science.

I value my correspondence with writers...I was in New York and had lunch with Oliver Sachs and compared notes with him - he is someone I really like. I love staying in written correspondence with some writers. That's enough for me.