柴油发动机是当今已知效率最高的原动机。

写作是唯一一个不赚钱也不会被人嘲笑的职业。

文章必须对天下人有益处。

History teaches us that in 100 years from now some of the assumptions you believed will turn out to be wrong. A good question to ask yourself today is “What might I be wrong about？”

死亡是唯一真正严肃的哲学问题。