煤矿工人是美国工业实力的无名英雄。

Diplomacy is not just about focusing on problems, but more importantly, finding opportunities and ways to solve them.

"Adaptation is the key to understanding behavior."

Never close your lips to those whom you have already opened your heart.

When life seems hard, the courageous do not lie down and accept defeat; instead, they are all the more determined to struggle for better future.

The power of causal reasoning is that it allows us to predict the effects of actions we have never taken.