Six degrees of separation doesn't mean that everyone is linked to everyone else in just six steps. It means that a very small number of people are linked to everyone else in a few steps, and the rest of us are linked to the world through those special few.

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.

It wasn't an excuse. It was a fact. He'd had to make his way alone, and no one - not rock stars, not professional athletes, not software billionaires, and not even geniuses - ever makes it alone.

What track needs to figure out: how to engage us between the races. Instead, the entire off-the-track conversation is about doping. This is how you kill a sport.

We sometimes think of being good at mathematics as an innate ability. You either have "it" or you don't. But to Schoenfeld, it's not so much ability as attitude. You master mathematics if you are willing to try.

You may hate Hillary Clinton and you may have good reason for hating Hillary Clinton, but Hillary Clinton is one person who even if she's elected will be gone one day and you still have the task of keeping American democracy going.

Once a musician has enough ability to get into a top music school, the thing that distinguishes one performer from another is how hard he or she works. That's it. And what's more, the people at the very top don't work just harder or even much harder than everyone else. They work much, much harder.