magfrump comments on Existing Absurd Technologies - Less Wrong Discussion
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The Elitzur–Vaidman bomb-tester isn't involved in any existing technology as far as I know, but it has apparently been verified in a lab and violates intuitions on how the world is supposed to work at the level of basic logic. ("Stuff that didn't happen can't matter.")
I would say this means "'anthropics' (i.e. branch selection effects) is relevant to the physical world, not just people."