"Causal inference requires careful thought about the assumptions underlying your analysis."

生活就像一架钢琴，白键代表快乐，黑键代表悲伤。但在人生的旅途中，请记住黑键也能创造音乐。

The power of a story lies in its ability to connect us to others.

The only phrase I've ever disliked is, 'Why, we've always done it that way.' I always tell young people, 'Go ahead and do it. You can always apologize later.'

能源独立能增强经济实力并提升国家安全。

改变始于一小步，但需要集体的努力才能持久。