"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

OPEC no longer holds all the cards in global oil markets.

教学的艺术是帮助发现的艺术。

数学中最美丽的东西是复杂背后的简单思想。

Simplicity is the seal of truth.

我疯了，我疯了。这就是我大脑的工作方式。我不正常。我的想法不一样。我的大脑一直在运转。

The mind is a biological problem-solving device.

胜利的唯一方式就是永不投降。