Shark Tank: Kevin O'Leary and Lori Greiner Buy Into Millennial Firm Revolutionizing Vending Machines

If a digital billboard and a vending machine really, really loved each other and had a baby, it would look like a Vengo -- the revolutionary brainchild of 32-year-old Brian Shimmerlik. His wall-mounted, flat-screen, touch-operated computer displays ads and dispenses anything from candy bars to lipstick to USB cords.