I don't run out of material. I run out of time.

知识最大的敌人不是无知，而是以为自己知道。

"The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'"

网球是一项心理游戏。每个人都健康，每个人都打出很棒的正手和反手——重要的是头脑。