Bertrand Russell writes in Our Knowledge of the External World:
What's the difference between physics and religion?In physics as ordinarily set forth, there is much that is unverifiable: there are hypotheses as to (a) how things would appear to a spectator in a place where, as it happens, there is no spectator; (b) how things would appear to a spectator in a place when, in fact, they are not appearing to anyone; (c) things which never appear at all.
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