所有老人共同的大秘密是，在七八十年里，你其实并没有改变。你的身体变了，但你一点都没变。

性能的关键在于优雅，而不是大量的特殊情况。

The magic number 150 suggests that the size of our social networks is limited by the size of our brains.

All life comes from an egg.

It is not shame for a man to learn that which he knows not，whatever his age.