A 96-year-old billionaire recorded a 42-minute lecture on behavioral finance that's become an underground must-watch in the investment world. He covered 25 psychological biases that cause people to make terrible financial decisions—material that MBA programs charge $200,000 to teach. The kicker: he gave it away for free, on camera, without selling anything or promoting a course afterward. What makes this notable is what he actually said. He called crypto antisocial. He said index funds will outperform most active managers. He described private equity as full of wretched excess. He said all this in a room full of professional money managers, and nobody pushed back. A hedge fund analyst at a major firm told the author this is the first thing they show new hires—not a textbook, not a trading model, just this video. The lecture apparently contains insights that still haven't made it into standard finance curricula. He explained not just what biases exist, but why intelligent people keep making the same mistakes despite knowing better. The author notes that 40 million people know his name, but almost none have actually watched him lay out how their own brain works against them. He died the year after recording it.