The man who created the 5-hour Energy drink says he has more money than he needs - about $4 billion more. So he's giving it away, spending his fortune on a quest to fix the world's biggest problems, including energy. Manoj Bhargava has built a stationary bike to power the millions of homes worldwide that have little or zero electricity. Early next year in India, he plans to distribute 10,000 of his Free Electric battery-equipped bikes, which he says will keep lights and basic appliances going for an entire day with one hour of pedaling. He's [also] working on ways to make saltwater drinkable, enhance circulation in the body, and secure limitless amounts of clean geothermal energy - via a graphene cord. If you have wealth, it's a duty to help those who don't," says Michigan resident Bhargava, 62, in a documentary released Monday, Billions in Change, about his Stage 2 Innovations lab. "Make a difference in people's lives," he says, "Don't just talk about it." Could his bike really work? The first 50 ... will be tested in 15 or 20 small villages in the northern state of Uttarakhand before a major rollout. He says it could provide electricity for the developing world and offer post-storm backup power in wealthier countries. [He] says he doesn't see altruism in his philanthropy. "I like work," he says. "It's not giving back. It's what else am I going to do?"