[simiones]

> Turing completeness means a computer can simulate anything that can be simulated by math

Technically, it is not proven that Turing machines can compute all computable functions, so there is some purely theoretical possibility that the brain could be able to compute functions that a Turing machine can't.

Personally I find that extremely unlikely, and agree that it would be extremely surprising. But it wouldn't invalidate anything we have proven so far.

[marvy]

It would imply that our brains are using currently-unknown physics, since all current theories are computable.