Lewis’ own attempt “to thread a course between the rock of fallibilism and the whirlpool of skepticism” (ibid., 566) involves embracing EC: We may say with the infallibilist that S knows that p iff S’s evidence eliminates “every” possibility in which not-p (ibid., 551). But since ‘every’ is restricted to a particular conversational domain (ibid., 553–554), and since certain not-p possibilities will be “properly ignored” in a given situation, we preserve our intuitive non-skepticism.