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Stuff of Genius - The Story of the Stethoscope

Nowadays it seems that every doctor has a stethoscope. But who invented this nifty device, and how? Tune in to learn more. http://howstuffworks.com http://www.facebook.com/StuffofGenius http://itunes.apple.com/us/podcast/the-stuff-of-genius/
Length: 02:11

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