To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death.

预测往往反映的是预测者当前的知识和偏见，而非真实的未来。

化学是我们日常生活的无声建筑师。