Living a long life, the conventional wisdom at the time said, depended to a great extent on who we were-that is, our genes. It depended on the decisions we made-on what we chose to eat, and how much we chose to exercise, and how effectively we were treated by the medical system. No one was used to thinking about health in terms of community.

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I don't go to an office, so I write at home. I like to write in the morning, if possible; that's when my mind is freshest. I might write for a couple of hours, and then I head out to have lunch and read the paper. Then I write for a little bit longer if I can, then probably go to the library or make some phone calls. Every day is a little bit different. I'm not highly routinized, so I spend a lot of time wandering around New York City with my laptop in my bag, wondering where I'm going to end up next. It's a fairly idyllic life for someone who likes writing.

Our acquaintances—not our friends—are our greatest source of new ideas and information. the internet lets us exploit the power of these kinds of distant connections with marvellous efficiency.

The iPod is clearly a tipping point (and I'm not quite sure it is a wholly positive development), because it is a revolution in the way that we consume creative property, which I would call art. It has radically changed the relationship between the artist and the audience, how money changes hands, and how much money changes hands. Music was the first, and books are coming next. The Kindle or some form of electronic book is clearly inevitable, and it will massively reshape how books are sold, who pays for them, and how they're consumed. It is going to be really fascinating.

So long as the stereotype is used as a way of understanding how to fix the problem as opposed to demonizing a people or writing them off, then I think it's OK.

Emotion is contagious.