It has always been easy to hate and destroy. To build and to cherish is much more difficult.
认为世界上只有一种真理,而自己正掌握着它,在我看来这是世界上所有邪恶最深的根源。
每一个实验,无论成功与否,都会教会我们一些有价值的东西。
数学家最好的作品是艺术,一种高度完美的艺术,像想象的最秘密的梦想一样大胆,清晰而透明。
Randomized evaluations can help us understand what works and what doesn't in development.