Great video here on Bell's Theorem, which is the idea that quantum mechanics results in phenomena that cannot be explained with any local hidden variable theory (related to Eninstein's spooky action at a distance objection to quantum mechanics).
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It is generally interpreted to mean that either realism (counterfactual definiteness, or the idea that even if a measurement is not performed, the measured value still exists) or locality is false. The polarized lens demonstration here is great:https://youtu.be/zcqZHYo7ONs
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