出门时笑一笑，不要心怀悲哀，广阔的胸怀处处都能敞开。

Natural experiments can provide valuable insights into economic questions.

The most effective way to destroy people is to deny and obliterate their own understanding of their history.

技术可以改变行业，但前提是我们以远见拥抱它。

I don’t really have studios. I wander around around people’s attics, out in fields, in cellars, anyplace I find that invites me.