"the hypothesis we're talking about depends so strongly upon something we can't prove to be true"
Or prove to be false?
It used to be the case that science proceeded by making empirically testable hypotheses and testing them, discarding the duds and retaining the not-yet-proven-to-be-duds. Now we seem to be proceeding by only hypothetically testing hypotheses.
It's the white one with a big ferric chloride stain.