Physicist Al Bartlett stands at a chalkboard and makes a single argument: humans are terrible at understanding exponential growth, and that failure is going to cost us. He walks through the math of compounding rates step by step, using a bacteria-in-a-bottle thought experiment to show how a population that doubles every minute looks like it has plenty of room right up until the moment it doesn't. From there he applies the same arithmetic to oil reserves, coal supplies, and population figures, arguing that modest annual growth rates produce staggering totals within a human lifetime. Bartlett delivered this lecture more than 1,600 times over 36 years, roughly once every nine days, to students, executives, and scientists, and the version here preserves that stump-speech quality: no reenactments, no location shooting, just a blackboard, a pointer, and a professor working through numbers most audiences have never been asked to sit with. The lecture's staying power comes from how plainly it makes compounding growth feel dangerous rather than abstract.