"Because he says he can't stand you and you act like you can't stand him, and whenever a man and a woman behave like that toward each other, it usually means something's going on."

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If I say [electrons] behave like particles I give the wrong impression; also if I say they behave like waves. They behave in their own inimitable way, which technically could be called a quantum mechanical way. They behave in a way that is like nothing that you have seen before.

— Richard P. Feynman