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Star Wars: The Rise Of Skywalker, the final film in the epic Star Wars series, will hit the big screens on December 19. Science fiction in general – and Star Wars in particular – is a hugely popular genre, much because of the titillating possibility that the mind-blowing technology we see on screen could one day work.

Your vacuum cleaner that you leave to do its job while you are away is a robot. It senses the world around it and makes driving decisions as it sucks and sweeps.
But your washing machine is not a robot. You tell it how to wash when you select the cycle and it gets on with it. There are grey areas and the definition is debated, but let’s leave it there.