The Church Chering Duch Principle

In laying the foundations for quantum computation, David duch proved what was then sometimes called churing's thesis. That implies anything in physical reality can be simulated by a computer from atoms to weather systems,. galaxies, even, in principle, a human brain. Quanton theory mandates we can never know with absolute mathematical certainty that a particular outcome must happen. There is always a range, however small the chance of error. It does not matter, it is not zero, is the point. So physical systems evolve in ways we cannot know for sure and that includes brains and the outcomes of any computation.