Why Medieval Castles Stayed Warm At -40°F While Modern Homes Freeze

Transcript

Picture [Applause] a medieval castle. Stone walls 3 ft thick. No insulation. Windows that are basically holes in the wall. Outside temperature -20° F. Now picture your modern home. Insulated walls, double pane windows, central heating. Yet when the power goes out for 12 hours in winter, you're wearing three coats and can see your breath indoors. In... Read More