Knowledge

Is it possible to prove the existence of ghosts? By prove I mean that the best explanation for such and such an occurrence would be that it was caused by a disembodied spirit. Am I right in thinking that this would be impossible in principle, and that there would always be a more rational explanation?

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The idea of a "disembodied spirit" is hardly a clear one. And no doubt some ways of trying to fill out this idea lapse into sheer incoherence. Understood in such a way, there just can't be any such things as "disembodied spirits". And non-existent beings can't do any causing!

But let's suppose we can spell out an internally coherent theory that purports to explain various occurrences by postulating the existence of things that, by the lights of our current scientific beliefs, do look decidedly ghostly. Well, it could in principle turn out that, by our best standards of theory assessment, this surprising theory in the end trumped rival theories. Why not? After all, similar things have happened often enough in the history of science -- meaning that initially whacky looking theories postulating weirdly spooky stuff (action at a distance! photons going through both slits!! many-dimensional strings?!?) can begin, given enough successes, to look to be the best game in town, and even come to be firmly accepted.

Though I think I'd stake my mortgage against a ghost story turning out to be a serious runner ...

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