宇宙将目光投向一个二维生物，它一生都在为后来成为地球的东西服务，它可以旅行数百万年，并且总是会回到它的起点，它永远不会意识到它上面或下面的是什么。
The universe would look to a two-dimensional creature who spend its life moving on the service of what turned out to be a globe， it could travel for millions of years and would always return to its starting point， it would never be conscious of what was above it or beneath it.
没有必要接受你所知道的生活强加给你的选择。
I believe in the power of music to heal, to inspire, and to bring people together.
无限小在自然中的作用是无限大的。
Theorems are the permanent literature of mathematics.
The future of life on Earth depends on our ability to take action. Many individuals are doing what they can, but real success can only come if there is a change in our societies and our economics and in our politics.