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Originally Posted by D as in David
Isn't a toddler merely an incomplete adult human? Unless we know what "complete" is, we could be close or astronomically far away from complete.
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We do know what a complete theory would look like, though. It would explain all observed reality from the subatomic to the cosmic and further make testable and accurate predictions of phenomena we have not yet observed. Our current theories can already do both these things, just not as one unified set of equations.
I think people misunderstand what having a correct and complete theory of physics really means. It's like (since this is a hockey site) knowing the rules of hockey - it's very useful to know, but knowing the complete rules doesn't mean you know everything about hockey. We can determine the entirety of the laws of physics and we still won't know everything that's in the universe, either.