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Tyrrell_McAllister comments on No One Knows What Science Doesn't Know - Less Wrong
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Apparently the full quote from Richard Feynman is:
"I think I can safely say that nobody understands quantum mechanics."
This was in 1965. Everett's first paper was in 1957 IIRC. So not only was Feynman mistaken about nobody at that time understanding quantum mechanics, but he thought this could be said safely? When there are billions of people in the world, and all ignorance and confusion is a property of the map rather than the territory?
Feynman was one of the great Traditional Rationalists, but sometimes he really does manage to get it completely wrong. Einstein was much worse in the same department: "You do not really understand something unless you can explain it to your grandmother"!?
So long as the key link between the QM formalism and empirical observations is a mystery, I think it's fair to say that no one understands QM completely. In context, is it too charitable to read Feynman as referring to still-outstanding mysteries such as that?