Ian Leslie is a journalist writing about the science of human behaviour, drawing on a wide range of interdisciplinary expertise. He is the author of Born Liars: Why We Can’t Live Without Deceit, and Curious: The Desire to Know and Why Your Future Depends On It. Ian is currently researching and writing a book on the topic of “productive disagreement”. We live in a world that features more argument, and more hostile conversations, than ever. Much of it takes place in an environment that is relatively new and the rules of engagement aren’t clear. What can we learn from scholars who have studied disagreement and from professionals who regularly have high-pressure, conflict-ridden conversations?