Abstract
The argument template of chapter 3 is taken together with other live hypotheses to generate other kinds of live scepticism. For instance, one can focus on error theories with regard to colour, or pain location, or character traits. Or, oddly enough, we can plug in, as a live hypothesis, the hypothesis that no one knows any external world proposition. The upshot is that in intellectual communities, in which error theories about belief, pain locations, character traits, and colour are live, mere mortals don’t know that fire engines are red, don’t know that they sometimes have pains in their lower backs, don’t know that John Rawls was kind, and don’t even know that they believe any of those truths.