Are paperclips going to destroy life as we know it? What can Mickey Mouse teach us about how to programme AI? Could a more rational approach to life be what saves us all? This is a book about about a community of people who are trying to think rationally about intelligence and what insight they can and can't give us about the future of the human race. It explains why these people are worried about an AI apocalypse, why they might be right, and why they might be wrong. It is a book about the cutting edge of our thinking on intelligence and rationality right now by the people who stay up all night worrying about it.