Why the world is not peaceful and what happens when strangers meet. What happened when people from different societies came together – did they always fight or did they find ways to coexist peacefully? How did they manage to agree on common values, ideals, and rules? Bestselling author Yuval Noah Harari addresses these pressing questions in his new book, which also resonates with young people seeking answers: why there are so many wars and how strangers can learn to live together peacefully. He draws a vivid arc from ancient Rome to the Middle Ages, from Carthage to Mongolia, and tells engagingly and accessibly about the coexistence of people from diverse backgrounds, about wars, and the encounters between different religions.