The article discusses a simple model of how people make decisions in repeated games where the outcomes can vary. In these games, cooperation is not just about choosing a specific action, but about how players behave over time. The model shows that even in complex situations, there are strategies that lead to cooperation and mutual benefit. These strategies involve choosing actions that maximize the total payoff for both players, and punishing opponents who don't play along. Surprisingly, introducing mistakes into the game actually encourages more cooperative behavior to evolve.