This slim book is unusual in taking us through the story of a single scientific study - and it's very informative in the way that it does it. The book makes slightly strange reading, as I was one of the participants in the study - but that's not surprising. According to Jean-François Bonnefon, by the time the book was published, around 100 million people worldwide had taken part in the Moral Machine experiment. The idea behind the study was to see how the public felt self-driving cars should make what are effectively moral decisions. Specifically, in a dilemma where there was a choice to be made between, say, killing one or other person or groups of people, how should the car decide? As a concept, Bonnefon makes it clear this is a descendent of the classic 'trolley' problem where participants are asked to decide, for example, whether or not to switch the points so a tram that is currently going to kill five people will be switched to a track where it will kill one perso...