一个问题如果在计算机上可以快速解决，那么它属于P类问题；如果一个解可以快速验证，那么它属于NP类问题。

Gratitude unlocks the fullness of life. It turns what we have into enough, and more. It turns denial into acceptance, chaos to order, confusion to clarity. It can turn a meal into a feast, a house into a home, a stranger into a friend.

始终以最终用户为设计核心；功能永远不应为美学而牺牲。

在每个国家，最重要的是人民的教育。

最好的故事是挑战我们假设的故事。