ABSTRACT
This chapter contains a very brief introduction to scepticism, perhaps just framing an issue, followed by an example. It is followed by a short discussion and then a series of questions. Roughly, the idea seems to be this: if one knows p, and q entails not-p, then he knows that not-q is the case. And so if he do not know not-q, then he do not know p. This is something that the epistemic sceptic, who will claim that we can never know anything, can try to exploit. The questions are intended to get the philosophy students thinking about this problems. They have used these kinds of questions in seminars as the questions set for seminars, so they also think that they can be used to spark conversation and discussion. The chapter also gives a cursory sketch of some of the ways in which philosophers have responded to the thought experiment.
