"In observational studies, we often have to rely on assumptions that are not directly testable."

要理解一个社会，看看它的垃圾。

Home is not a place, it's a feeling.

成功的企业是那些像重视利润一样重视员工的企业。

History is not the past. It is the present. We carry our history with us. We are our history.

The most valuable currency in business is trust.