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The Trunkline explains how things actually work: the science, engineering and hidden systems behind the world around you. How steel is made, how roads are built, how the power grid works, how the internet crosses the ocean, how GPS works, how much water AI uses. One video, one system, followed end to end, with the real numbers on screen. New series: How Materials Are Made. Steel, aluminum, cement, glass, copper and more. New explainers every Tuesday and Saturday, and a new Short every day.