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 spoke 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。