我不害怕坠入爱河，我只是害怕再次爱上错误的人。
I'm not afraid to fall in love, I'm just afraid to fall for the wrong person again.
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
The best science often comes from asking the simplest questions.
Human beings are not born once and for all on the day their mothers give birth to them, but life obliges them over and over again to give birth to themselves.