First, the definition of a fact waffles between truth and proof — two obviously different features. Things can be true even if no one can prove them. For example, it could be true that there is life elsewhere in the universe even though no one can prove it. Conversely, many of the things we once “proved” turned out to be false. For example, many people once thought that the earth was flat. It’s a mistake to confuse truth (a feature of the world) with proof (a feature of our mental lives). Furthermore, if proof is required for facts, then facts become person-relative. Something might be a fact for me if I can prove it but not a fact for you if you can’t. In that case, E=MC2 is a fact for a physicist but not for me.
