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.

Bhargava, who dropped out of Princeton University after a year because he was bored and then lived in ashrams in his native India for 12 years, doesn’t stop at