King Charles III is Dracula's distant cousin. Governments are hiding information about UFOs. COVID-19 came from outer space. These sound like absurd statements, but some are true, and others are misinformation. But what exactly is misinformation? Who believes and spreads things that aren't true, and why? What solutions do we have available, and how well do they work? This book answers all these questions and more. Tackling the science of misinformation from its evolutionary origins to its role in the internet era, this book translates rigorous research on misleading information into a comprehensive and jargon-free explanation. Whether you are a student, researcher, policymaker, or changemaker, you will discover an accessible analysis on human belief in today's world and expert advice on how to prevent deception.