It’s no coincidence that a lot of philosophers are big fans of science fiction. Philosophers like to think about far-fetched scenarios or ‘thought experiments’, explore how they play out, and think about what light they can shed on how we should think about our own situation. What if you could travel back in time? Would you be able to kill your own grandfather, thereby preventing him from meeting your grandmother, meaning that you would never have been born in the first place? What if we could somehow predict with certainty what people would do? Would that mean that nobody had free will? What if I was really just a brain wired up to a sophisticated computer running virtual reality software? Should it matter to me that the world around me – including other people – is real rather than a VR simulation? And how do I know that it’s not?
Questions such as these routinely get posed in sci-fi books and films, and in a particularly vivid and thought-provoking way. In immer
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