We thought we had such problems. How were we to know we were happy?
Art is not what you see, but what you make others see.
All the effects of nature are only the mathematical consequences of a small number of immutable laws.
睡眠不是奢侈品,而是大脑的必需品。
用程序证明四色定理不会改变数学——它只是证明了这个挑战了一个世纪的定理是一个有限的问题。
Even if I knew that tomorrow the world would go to pieces, I would still plant my apple tree.