The essence of causal inference is to go beyond the data and ask what would happen if we intervene.

"The past is never dead. It's not even past."

Take one simple thing — almost anything — but take it extremely seriously， as if it was the only thing in the world， or maybe the entire world is in it — and by taking it seriously you’ll light up the sky.

The act of discovery is not reserved for the genius alone.

你不必完美，只需真实。

每一本书都是通往另一个世界的门。