Physics Saves Lives

A college physics professor was explaining a particularly complicated
concept to his class when a pre-med student interrupted him.

"Why do we have to learn this stuff?" the young man blurted out.

"To save lives," the professor responded before continuing the lecture.

A few minutes later the student spoke up again. "So how does physics
save lives?"

The professor stared at the student for a long time without saying a
word. Finally the professor continued.

"Physics saves lives," he said, "because it keeps certain people out of
medical school."