当随机化不可行时，匹配方法可以是一个强大的工具。
"Matching methods can be a powerful tool when randomization is not possible."
Culture is not just one aspect of the game, it is the game.
The most important thing is to be willing to question everything.
"I don't believe in happy endings. Life doesn't have them, so why should literature?"
The causal revolution is about empowering machines to think like humans.