There is a lengthy Thread in Sciforums General Philosophy which is basically silly. There might be similar Threads in forums other than General Philosophy. It should be noted that there is no absolute proof/disproof of any conjecture. There are only proofs that certain statements are true if some set of axioms are valid/true. Those who claim they know they are not merely a brain in a vat provide no axioms to support their belief. Those who claim there can be no such proof do not really believe they are a brain in a vat. They enjoy arguing. I want to go on record as not believing that I am a brain in a vat. I consider such a belief silly. BTW: I do not want to waste time thinking up an axiomatic system which could prove or disprove the conjecture. It seems like a waste of time to attempt such a quest & might be an impossible task. It could be that proofs of conjectures more complex than mathematical/logical conjectures might require axioms which are designed to prove the desired conclusion. Id est: All such proofs might beg the question, rather than proving/disproving it.