I have suggested before that the one thing “everyone knows” about quantum mechanics is that the quantum world is fuzzy and uncertain. Actually, there’s another thing, too. “Everyone” has heard of Schrödinger’s cat.

That’s why there are so many jokes about it. Schrödinger is driving along when he is pulled over by a policeman. The officer looks the car over and asks Schrödinger if he has anything in the boot.

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