Legendary investor Howard Marks reveals how second-level thinking separates winners from the crowd, why he invested $7 billion during the 2008 financial collapse despite massive uncertainty, and what AI's unprecedented autonomy means for the future of investing. At 80, Marks shares 39 years of partnership wisdom, his evolved stance on AI, and why humility—not certainty—defines great decision-making. Second-level thinking requires variant perception—seeing something different from consensus investors and having the courage to bet on that contrarian view even when uncertain.