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Quantum Mechanics and Dark Matter
Back in the 1920s we didn't actually have any single very good theory of quantum mechanics. But starting in the 50s with Bomiian mechanics and many worlds, we have now a handful of perfectly good physical theories that all give the same predictions. That's a weak understanding. We kind of have theories that might be right, but we don't know if any one of them is right or even if the one that will turn out to be right is one they haven't invented yet.