The social brain hypothesis suggests that our intelligence evolved to manage our complex social lives.

青年的危机不是生物性的，而是社会和政治性的，它需要一种新的语言来理解他们斗争性质的变化。

下一场农业革命将是隐形的——它发生在实验室里、数据云端，最重要的是发生在我们思维方式中。

The past is a shadow that follows you everywhere.

I was working at a financial firm in New York City with a bunch of very smart people， and I had a brilliant boss that I much admired. I went to my boss and told him I wanted to start a company selling books on the Internet. He took me on a long walk in Central Park， listened carefully to me， and finally said， "That sounds like a really good idea， but it would be an even better idea for someone who didn't already have a good job." That logic made some sense to me， and he convinced me to think about it for 48 hours before making a final decision. Seen in that light， it really was a difficult choice， but ultimately， I decided I had to give it a shot. I didn't think I'd regret trying and failing. And I suspected I would always be haunted by a decision to not try at all. After much consideration， I took the less safe path to follow my passion， and I'm proud of that choice.