When crime drops dramatically in New York for no apparent reason, or when a movie made on a shoestring budget ends up making hundreds of millions of dollars - we're surprised. I'm saying, don't be surprised. This is the way social epidemics work.

Trump is an innovator who has shown how out of step the political establishment was. Which I think, probably, in the long term will be healthy. We have to figure out how to reinvigorate our political institutions and he's demonstrating to us the urgency of that task.

Often a sign of expertise is noticing what doesn't happen.

It's not how much money we make that ultimately makes us happy between nine and five. It's whether or not our work fulfills us. Being a teacher is meaningful.

It's very hard to find someone who's successful and dislikes what they do.

I worry that track is going to enter into an impossibly complicated stage, where our understanding of the complexities of human physiology - and our ability to accentuate and exploit them - is going to make the notion of pure competition impossible.

Who we are cannot be separated from where we're from.