Natural experiments are a powerful tool for understanding causal relationships in the real world.

世界是一个混乱和困惑的地方，唯一理解它的方法就是找到自己的道路。

旅行对偏见、固执和狭隘是致命的。

数学是人类精神最美丽和最强大的创造。

One solution fits all is not the way to go.All these cultures are different.The right culture for the Mayo Clinic is different from the right culture at a Hollywood movie studio.You can't run all these places with a cookie-cutter solution.