Who built that: awe-inspiring stories of American tinkerpreneurs

Part I: Engineers of prosperity. Maglite's Tony Maglica : torchbearer of the American Dream ; The wizards of cool : air-conditioning innovators Willis Carrier and Irvine Lyle ; Roebling : the family that built America's most famous bridges

Part II: The miracle of the mundane. I, toilet paper ; Crowning glory : how William Painter's bottle caps became a $9 billion business ; "Keep looking" : how Painter's razor-sharp genius inspired King Gillette ; Seeing dollars in the dirt : the wisdom of Charles E. Hires

Part III: BFFs : dynamic duos of American business. Death-defying mavericks of glass : Edward Libbey and Michael Owens ; "Perfect partnership" : Westinghouse, Tesla, and the harnessing of Niagara Falls

Part IV: Past, present, future. Smart limbs : the next generation of American tinkerpreneurs.