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Penny: [Sheldon doesn't have a driving license] Why didn't you just get a license at sixteen, like everybody else?Sheldon Cooper: I was otherwise engaged.Penny: Doing what?Sheldon Cooper: Examining perturbative amplitudes in n=4 supersymmetric theories, leading to a reexamination of the ultraviolet properties of multi-loop n=8 supergravity, using modern twistor theory.Penny: Well, how about when you were seventeen?

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