The truth is, I don't know what I'm doing most of the time, but I do it anyway.

The beauty of instrumental variables is that they allow us to see the world in a new light.

The only lies for which we are truly punished are those we tell ourselves.

科学是人类智慧的结晶，是推动社会进步的重要力量。

网络的力量在于它的普遍性。无论是否有残疾，每个人都能访问是一个重要方面。