The MWI is surely the most polarizing of interpretations. Some physicists consider it almost self-evidently absurd; ‘Everettians’, meanwhile, are often unshakeable in their conviction that this is the most logical, consistent way to think about quantum mechanics. Some of them insist that it is the only plausible interpretation of quantum mechanics – for the arch-Everettian David Deutsch, it is not in fact an ‘interpretation’ of quantum theory at all, any more than dinosaurs are an ‘interpretation’ of the fossil record. It is simply what quantum mechanics is. ‘The only astonishing thing is that
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