Ray Dalio reveals the investing framework that transformed him from broke and fired at 34 to building the world's largest hedge fund. His mantra: find 15 uncorrelated return streams to reduce 80% of risk without sacrificing returns. Beyond wealth, Dalio emphasizes that success requires knowing your nature, building meaningful relationships, and understanding that pain plus reflection equals progress—the true formula for a fulfilling life. Diversifying across 15 uncorrelated return streams reduces portfolio risk by approximately 80% without lowering returns, increasing the return-to-risk ratio by a factor of five.