The chess-board is the world; the pieces are the phenomena of the universe; the rules of the game are what we call the laws of Nature.  

"The best decisions are often made by a group of people who are not afraid to challenge each other's ideas."

The course of history is the slow march of freedom.

经济不平等不仅是一个道德问题，也是一个经济问题。

我们开采的每一吨煤炭都承载着对工人、社区和地球的责任。