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?” one 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.”

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