在我们认识到我们过去所做的很多事情是非常愚蠢的之前，我们不会变得更聪明。

Every time a coal plant closes, a piece of America's heart closes with it.

The beauty of mathematics is that it allows us to abstract away the complexities of the real world and focus on the underlying principles.

一个和谐的社会，不是争议的消失，而是公义的彰显。