Time travel is the most frustrating thing in the world. You can't change anything, and you can't stop anything from happening.

The most effective way to promote democracy is not through military intervention but through the slow and steady process of building institutions and promoting economic development.

The key to innovation in economics is to question conventional wisdom.

女人的美不在于她穿的衣服、她的身材或她梳头的方式。女人的美必须从她的眼睛中看到，因为那是通往她心灵的门口，是爱所在的地方。#

研究古DNA就是与逝者对话。