To paraphrase Richard Feynman: If you think you understand quantum mechanics, you don't understand quantum mechanics.

Along the same lines, if you have made sense of Schrödinger's Cat thought experiment, you don't understand it.

But that's not to say it can't be explained. Which is exactly what we do in this episode of the history of being human - present one of the most enduring, and most popularly recognizable, legacies of early quantum theory.

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