Misinformation – from fake news to conspiracy theories and more – is everywhere, and however savvy we are, it can be hard to avoid being taken in. Sander Van der Linden looks at the psychology behind misinformation, and tells us how we can inoculate ourselves and others against its spread, discern fact from fiction and push back against methods of mass persuasion. Van der Linden is the professor of social psychology in society and director of the Cambridge Social Decision-Making Lab in the Department of Psychology at the University of Cambridge. He is often dubbed Cambridge’s ‘Defence Against the Dark Arts teacher’.