When a child asks an endless string of “why？” questions， the smartest reply is， “I don’t know， what do you think？”

Silence is a language that can be learned.

Every ton of coal we extract carries a responsibility—to our workers, communities, and the planet.

Everyone is a genius. But if you judge a fish by its ability to climb a tree, it will spend its whole life believing it is stupid.

The truth is a knife, and lies are the bandage.

Quality is more important than quantity. One home run is much better than two doubles.

数学不是关于数字、方程、计算或算法的：它是关于理解的。