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.

Success is not a function of individual talent. It's the steady accumulation of advantages. It's bound up in so many other broader circumstantial, environmental, historical, and cultural factors.

The sense of possibility so necessary for success comes not just from inside us or from our parents. It comes from our time: from the particular opportunities that our place in history presents us with.

David Epstein, the author of the best book on athletics in recent memory - "The Sports Gene" - wrote to me to say that he thinks I'm being overly generous. He points out that, for years, there used to be an "all-star challenge" on television, in which the best professional athletes from a variety of sports competed in a kind of makeshift decathlon.

Nobody accomplishes success by themselves.

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.

My highest compliment is when someone comes up to me to say, "My 14-year-old daughter, or my 12-year-old son read your book and loved it." I cannot conceive of a greater compliment than that - to write something that as an adult I find satisfying, but also that manages to reach a curious 13- or 14-year-old.