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

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.

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

Data, I think, is one of the most powerful mechanisms for telling stories. I take a huge pile of data and I try to get it to tell stories.

Purity is a good mask for corruption because it discourages inquiry.

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

If you own a gun and have a swimming pool in the yard, the swimming pool is almost 100 times more likely to kill a child than the gun is.