ABSTRACT
This chapter contains a very brief introduction to time travel and the grandfather paradox, followed by an example. It is followed by a short discussion and then a series of questions. There are some philosophical concerns that time travel may be shown to be impossible. This would be a little surprising, given that some plausible scientific models of reality seem to imply that time travel is possible, even if we currently lack the means to take advantage of the fact. This presents an example case where a girl named Sara spends most of her formative years fascinated by guns. Over many years she trains, methodically, until she's a crack shot. The questions are intended to get the philosophy students thinking about these problems. They have used these kinds of questions in seminars as the questions set for seminars. The chapter also gives a cursory sketch of some of the ways in which philosophers have responded to the thought experiment.
