The study of automata and formal languages is fundamental to understanding the limits of computation.

You're dead if you aim only for kids. Adults are only kids grown up， anyway.

最好的故事不在书中，而在那些经历过的人的眼睛里。

椅子首先要拥抱身体，然后激发心灵。

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.