Top answer
You have a great physics teacher. He teaches you all that you know. You go back in time and meet him as a boy.
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You have a great physics teacher. He teaches you all that you know. You go back in time and meet him as a boy. You teach him physics. But you're teaching him what you learned from him, which means he learned it from you, but you only knew it because you learned it from him, but he only knew it because... you get the point.
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