成功不是终点，失败也不是致命的：重要的是继续前进的勇气。

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.

If a Nation expects to be ignorant and free in a state of civilization,it expects what never was and never will be....If we are to guard against ignorance and remain free,it is the responsibility of every American to be informed."

创新不仅仅是创造新产品；它关乎我们如何重新思考解决旧问题的方法。

I like to think of myself as a normal person who just happens to be able to sing.