Natural experiments are a powerful tool for understanding causal relationships in the real world.

I'm not going to compare myself to anybody. I'm going to do the best I can do. I'm going to work as hard as I can work. And I'm going to be the best that I can be.

韩寒自曝被女教师骚扰多年(2007年12月15日)

Eyes deceive and legs fail, but it's the stomach that gets you in trouble!

2013年：贝索斯致股东信《下放决策权以促进创新》

The world is full of obvious things which nobody by any chance ever observes.

挑战在于确保互联网仍然是一股向善的力量，一种赋能的工具，以及一个创新的平台。