The Last Artifact (FULL SPECIAL) | PBS America

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The Last Artifact follows the high-stakes race to redefine the world's base unit to measure weight and reveals the untold story of one of the most important objects on the planet. The kilogram was the last of the SI units still defined by a physical artifact - a man-made cylinder located in Paris. Over time, its mass mysteriously eroded, and unleashed a crisis with potentially dire consequences.

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