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Rephrased, the question becomes quite banal: "Can you know something has happened without having any evidence whatsoever?" No.



That's not quite the question. The question is more like, if phenomenon A occurs and we know that, given an observer C witnessing the occurrence of phenomenon A, consequence B also occurs, will consequence B occur even if there is no observer C to witness it? Science is based on the assumption that the answer is yes. That this appears to fall apart in the world of quantum mechanics is a paradox