We're living in an age of division. From abortion rights to immigration, gun control to climate change, civil debate has gone out the window. Manners, order, and respect are being eroded. Why can't we all be reasonable? The trouble is, what's 'reasonable' to one person is outrageous to another. In a world where we all think we're being reasonable, how can we figure out what's right? Looking back through history and around the world, Kirsty Sedgman set out to discover how unfairness and discrimination got baked into our social norms, dividing us along lines of gender, class, disability, sexuality, race... Instead of measuring human behaviour against outdated standards of rules and reason, this book argues that sometimes we need to act unreasonably to bring about positive change.