An incentive is a bullet, a key: an often tiny object with astonishing power to change a situation

The data don't lie: a Chicago street prostitute is more likely to have sex with a cop than to be arrested by one.

Solving a problem is hard enough; it gets that much harder if you’ve decided beforehand it can’t be done.

The gulf between the information we proclaim & the information we know to be true is vast. In other words: we say one thing & do another.

Levitt admits to having the reading interests of a tweener girl, the Twilight series and Harry Potter in particular.

As W.C. Fields once said: a thing worth having is a thing worth cheating for.

The key to learning is feedback. It is nearly impossible to learn anything without it.