"There is an old maxim that says that two empires that are too large will collapse. The analog in set theory is that two different theories that are too powerful must necessarily contradict each other."

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My impression is that a sense of rhythm, which has no analog in language, is unique and that its correlation with movement is unique to human beings. Why else would children start to dance when they're two or three? Chimpanzees don't dance.

— Oliver Sacks