我们最甜美的歌是那些讲述最悲伤思想的歌。
最令人兴奋的突破往往来自意想不到的地方。
The beauty of instrumental variables is that they allow us to see the world in a new light.
Rigor in proof is what separates mathematics from all other sciences.
Every decision we make today plants a seed for the forests of tomorrow.