Toby Walsh’s The Shortest History of AI begins and ends with a sermon against panic. ‘Our children’, writes Walsh, ‘are set to inherit a worse world than the one we were born into, due to a raft of problems, some of which are caused by AI.’ The next couple of decades ‘will be challenging’. Yet Walsh is unequivocal in his faith: first, that artificial intelligence scientists will eventually achieve their final goal, ‘matching human intelligence in all its richness’, and second, that such a feat will be ultimately beneficial to humanity. The secret to such optimism, in the face of acknowledged ‘challenges’ ranging from racial and gendered bias to the ‘existential’, lies in learning ‘the lessons of the past’. And this book, writes Walsh, is not a bad place to start learning those lessons.