一个有趣的事实是，岩石越古老，与今天的岩石差异越大。

How will you use your gifts？ What choices will you make？

最伟大的真理常常是我们无法用语言表达的。

Confidence comes from preparation and knowing your stuff.

In mathematics, the art of proposing a question must be held of higher value than solving it.

最好的故事是那些留给你的问题比答案更多的故事。