Jerry Murrell's mother used to tell him, you can always make money if you know how to make a good burger. In 1986 — after failing at a number of business ideas — Murrell opened a tiny burger joint in Northern Virginia with his four sons. Five Guys now has more than 1,400 locations worldwide and is one of the fastest growing restaurant chains in America. PLUS in our postscript "How You Built That," how Aiden Emilio and her husband created RexSpecs — UV-protecting goggles for dogs.