You’ve got to have models in your head. And you’ve got to array your experience—both vicarious and direct—on this latticework of models. You may have noticed students who just try to remember and pound back what is remembered. Well, they fail in school and in life. You’ve got to hang experience on a latticework of models in your mind.

时间总是充满惊喜，它以我们无法预料的方式流动。

Every experiment is a conversation with nature, and sometimes nature whispers its secrets.