The best time to plant a tree was 20 years ago. The second best time is now.

A key insight in learning theory is that the complexity of a hypothesis class is crucial for generalization.

我不是女权主义者，但我确实相信女性的力量。

在物理学的领域里，我们不仅是观察者，也是我们试图理解的现实的创造者。