If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.
Every sentence I utter must be understood not as an affirmation, but as a question.
A visitor to Niels Bohr's country cottage, noticing a horseshoe hanging on the wall, teasing the eminent scientist about this ancient superstition. "Can it be true that you, of all people, believe it will bring you luck?' 'Of course not,' replied Bohr, 'but I understand it brings you luck whether you believe it or not.'
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