At a pre-med university in St. Louis, we had to take a difficult class in physics. One day the professor was discussing a particularly complicated concept. A student rudely interrupted to ask Why do we have to learn this stuff?

To save lives. The professor responded quickly and continued the lecture. A few minutes later, the same student spoke¹ up again. So how does physics save lives? he persisted. It usually keeps the idiots like you out of medical school, replied the professor.

在圣路易斯的一所医学院预科大学，学生必须修一门很难的物理课。一天，教授正在探讨一个特别复杂的概念，一个学生粗鲁地打断他的话，问道：为什么我们一定要学这种东西？

为了救人。教授很快回答，继续讲课。几分钟后，那个学生再次大声坚持：那么物理怎么救人呢？教授回答：它通常可以把你这种笨蛋赶出医学院。