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Why wouldn't you last a minute? Because survival in extreme cold isn't about toughness—it's about physics. And modern humans have forgotten the rules. For millennia, Native Americans didn't just endure freezing nights; they engineered solutions based on a profound understanding of thermodynamics, aerodynamics, and material science. This is the lost blueprint of "ancient survival physics." This documentary deconstructs the science that kept them alive. We first analyze the Lakota teepee, revealing it as a masterpiece of aerodynamics and convection. Discover how its specific tilt, dual-wall lining, and adjustable smoke flaps created a perfect, self-regulating convection engine that provided warmth and fresh air. Next, we explore the different physics of the Haudenosaunee longhouse. This communal fortress wasn't about airflow; it was a lesson in thermal mass. Learn how it pooled the body heat of hundreds and used a smoky "thermal blanket" to create a stable, warm microclimate that could outlast any blizzard. Finally, we examine the physics of the human body: the "internal furnace." We break down the food science of pemmican, the 3,500-calorie super-fuel, and the material science of layered, breathable hides—a system that managed moisture and trapped air far better than many modern synthetics. This is the lost knowledge of resilience. They didn't just fight the cold; they understood its laws. And that knowledge is the one thing you wouldn't have.