史记

"Freedom is not something that anybody can be given. Freedom is something people take, and people are as free as they want to be."

Innovation in carbon capture technology is not an option—it's a necessity for sustainable energy.

Each Wal-Mart store should reflect the values of its customers and support the vision they hold for their community.

电的定律如此简单，可以用几行字表达，却又如此多样，其后果永远无法穷尽。

数学让我们看到支配周围世界的隐藏结构。