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The Stuff of Genius - Junk Food

During World War II, William Mitchell made a discovery that led to the emergence of junk food for the masses. Learn how tapioca led to pop rocks in this episode of The Stuff of Genius. http://howstuffworks.com http://www.facebook.com/StuffofGenius http://itunes.apple.com/us/podcast/the-stuff-of-genius/
Length: 01:36

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