They were little guys with big ideas, who started out with nothing, gave everything, and created something that changed the world, and their lives, forever. Discover the stories behind the inventions of the Lego brick, the intermittent windshield wiper, Madam C.J. Walker's hair supplies, and the smiley face. These incredible tales involve a child of slaves who defied prejudice, an engineer who fought a 30-year legal battle against the automotive industry, a designer who created a cultural icon for a $45 paycheck, and more. Air Date: Aug 2, 2015