n one corner of Manoj Bhargava’s office is a cemetery of sorts. It’s a Formica bookcase, its shelves lined with hundreds of garishly colored screw-top plastic bottles not much taller than shot glasses. Front and center is a Cadillac-red bottle of 5-Hour Energy, the two-ounce caffeine and vitamin elixir that purports to keep you alert without crashing. In eight years 5-Hour has gone from nowhere to $1 billion in retail sales. Truckers swear by it. So do the traders in Oliver Stone’s 2010 sequel to Wall Street. So do hungover students. It’s $3 a bottle, and it has made Bhargava a fortune.