If either hypothesis is true, I can’t know that the sun will rise tomorrow. Gloomy will not help to generate a worrying skeptical attack, though. The reason why not is that it is easy to see how I can know that it doesn’t obtain: easily accessible astronomical data and basic physics allow me to figure out that the sun will, indeed, rise tomorrow. Of course, the same astronomical data and physical laws entail that NUW is false, too. However NUW is more worrying because it entails that precisely the law-based inductive inference that I’d normally use to figure out that the sun will rise tomorrow can’t be trusted. What separates the nasty hypothesis from the tame ones isn’t that they entail the falsity of some of my ordinary beliefs (I have hands, the sun will rise tomorrow). Both nasty and tame hypotheses do that. Rather, what separates the nasty hypotheses is that they also entail that the sort of reasoning I would use to figure out whether the hypotheses themselves are true are untrustworthy across the board.
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