The conventional wisdom is often wrong. Crime didn't keep soaring in the 1990s, money alone doesn't win elections, and - surprise - drinking eight glasses of water a day has never actually been shown to do a thing for your health. Conventional wisdom is often shoddily formed and devilishly difficult to see through, but it can be done.

The Tipping Point is the biography of an idea, and the idea is very simple. It is that the best way to understand the emergence of fashion trends, the ebb and flow of crime waves, or, for that matter, the transformation of unknown books into bestsellers, or the rise of teenage smoking, or the phenomena of word of mouth, or any number of the other mysterious changes that mark everyday life is to think of them as epidemics. Ideas and products and messages and behaviors spread just like viruses do.

A study at the University of Utah found that if you ask someone why he is friendly with someone else, he’ll say it is because he and his friend share similar attitudes. But if you actually quiz the two of them on their attitudes, you’ll find out that what they actually share is similar activities. We’re friends with the people we do things with, as much as we are with the people we resemble. We don’t seek out friends, in other words. We associate with the people who occupy the same small, physical spaces that we do.

Now I basically just read spy stories because they're about solving a puzzle within the constraints of history. It's the tick tock, the clockwork that I'm interested in.

Re-reading is much underrated. I've read The Spy Who Came in from the Cold once every five years since I was 15. I only started to understand it the third time.

The particular skill that allows you to talk your way out of a murder rap, or convince your professor to move you from the morning to the afternoon section, is what the psychologist Robert Sternberg calls "practical intelligence." To Sternberg, practical intelligence includes things like "knowing what to say to whom, knowing when to say it, and knowing how to say it for for maximum effect.

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.