Mathematics is the art of asking the right questions and then finding their answers.
改变令人不适,但它是进步的必要条件。
Friendship is the bridge of the soul.
The world is what it is; men who are nothing, who allow themselves to become nothing, have no place in it.
I raised my kids to be independent—just like me.
I am not trying to imitate a photograph, I am trying to make one.