"Randomized experiments are the gold standard for causal inference, but they are not always feasible."

I'm not a place, I'm a dimension.

了解他人是智慧，了解自己是聪明

写作是与遗忘作斗争。

The most successful leaders are those who are humble enough to know they don’t have all the answers.

Mathematics is a way of thinking, not just a collection of facts.

Writing is a way of talking without being interrupted.

云是下一波创新的基础。