The rules of what tribes are and how they operate were encoded into our Social Brains over millions of years. In this chapter we use the SAFE Challenger toolkit to help decode social brain decision-making to see if the social brain sees itself in a safe or unsafe situation. This allows us to design interventions that make people feel safe, help them buy-in, and harness the power of the tribe to scale our organizations. SAFE Challenger toolkit allows us to run Tribe gatherings where people can challenge each other without objects being thrown.