Manoj Bhargava became a billionaire due to the success of his product, 5-Hour Energy. And, unlike many people that have more money than they could ever possibly spend, Bhargava is doing something good with it. Really good.
Bhargava is attempting to solve some of the world's biggest problems, namely energy and water. He started an investment fund called Stage Two Innovations. Currently, the organization is working on solutions to give people (in either rural areas or those who cannot afford it) clean water and free energy. For energy, they have created something that is essentially an exercise bike that, when used for an hour a day, is capable of powering the lights in a small rural home for 24 hours! They have also created a water purification device that will literally change the world, and also a blood circulation device that is already being used in the medical industry!
Again, it's great to see that someone is using their means to really do something positive. We definitely need more Manoj Bhargavas in this world!