Flat-head screwdrivers have been around for centuries, but when Henry Phillips realized he'd need a better screwdriver for power tools, inspiration struck. Learn more about his Stuff of Genius -- the Phillips Screwdriver -- in this episode. http://howstuffworks.com http://www.facebook.com/StuffofGenius http://itunes.apple.com/us/podcast/the-stuff-of-genius/
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