“Universal computers are capable of performing all the computations permitted by the laws of physics. Once a universal computer is constructed, all you have to do is to load it with the right programme, and it can simulate any other system that is physically allowed. This includes the biosphere, with all its splendid richness of animals, plants, and microorganisms; and, in principle, it even includes your brain, together with thoughts and emotions.”
―
Chiara Marletto,
The Science of Can and Can't: A Physicist's Journey Through the Land of Counterfactuals