A student is in biology lecture when the professor gets to a part he doesn't understand. The student asks, "I don't understand, why does this happen?" The professor answers, "You're not supposed to understand, it's chemistry."
So the student later takes a chemistry lecture and the professor gets to a part he doesn't understand. The student asks, "I don't understand, why does this happen?" The professor answers, "You're not supposed to understand, it's quantum mechanics."
So the student later takes a quantum mechanics course and the professor gets to a part he doesn't understand. The student asks, "I don't understand, why does this happen?" The professor answers, "You're not supposed to understand, it's quantum mechanics."
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