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 pressing questions in his new book that young people are also seeking answers to: why there are so many wars and how strangers can live together peacefully. He draws a connection from ancient Rome to the Middle Ages, from Carthage to Mongolia, and vividly and engagingly narrates the coexistence of people from various backgrounds, wars, and the encounters of different religions.