Remember the cheerfully sexist track "Girls" from the Beastie Boys' album Licensed to Ill? A new toy company, GoldieBlox, hijacked it, turned it on its head, and wants it to help turn little girls into budding engineers. Sean Pecknold directed and Brett Doar created the Rube Goldberg machine. Fast Company has the behind-the-scenes story of the video that went viral with more than six million YouTube hits so far.