I played street hockey in Riverside Park when I was a kid. I played goalie. I didn't make the hockey team in college, so I played lacrosse instead. I didn't play hockey again for 20 to 25 years, and then my son became interested in the game. I decided to pick it up again. A friend let me play backup on his team.

When I was a student at Princeton University, I was working part time in a grocery store. I saw an ad for teachers of a prep course. I don't remember what it paid, but it was easily double or triple the minimum wage.

Why do men outperform women on the SAT? The SAT's supposed to predict college grades. Women do better in high school and they do better in college. What's the problem here? Ah, the more you use, the more you start accepting that the SAT's coachable, the more problems you have with it.

I studied to be an architect. And I find tremendous similarities between building a company and the design process. Businesses have to do their planning on the fly in a fashion similar to an architect sketching.

The Internet rewards scale; by trading higher up-front costs for lower marginal cost, market leaders can invest in better technology and service. As a result, there is nothing online that is both great in quality and small in scale. Amazon wasn't originally a better bookstore than the small shops we mourn, but it is now.

Exciting discoveries in neuroscience are allowing us to fit educational methods to new understandings of how the brain develops.

I'd never taken an SAT prep course. They were for weaker students.