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The Story of Air Conditioning, the Barcode, and the Elevator Brake! - Our American Stories

Our American Stories

On this episode of Our American Stories, Tim Harford, an economist and best selling author of Fifty Inventions That Shaped the Modern Economy, tells the story of these three underappreciated inventions in history.

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The Story of Air Conditioning, the Barcode, and the Elevator Brake! - Our American Stories