Episode 18: Conservation Laws: The Universe's Ironclad Accounting System

Discover the invisible rules that govern everything in the universe. In this episode of Polymath, we explore conservation laws—the fundamental principles that say energy, momentum, and mass can never be created or destroyed, only transformed. Learn why roller coasters don't need engines after the first hill, why perpetual motion machines are impossible, why explosions follow perfect mathematical rules, and how Einstein revealed that mass and energy are the same thing. We'll show you how these laws explain everything from car crashes to rocket launches, from metabolism to nuclear reactions. More than just physics principles, conservation laws are powerful mental models that reveal a deeper truth: nothing comes for free, trade-offs are real, and the universe keeps perfect books. Whether you're explaining why your phone heats up, understanding how space missions work, or just trying to reason better about cause and effect, conservation laws are your guide to how the world actually works. No heavy math required—just clear explanations, memorable examples, and insights you'll use for life.