I watched this documentary a few days and it was incredibly impressed with some of the ideas and concepts presented by Manoj Bhargava. Manoj is the creator of 5-hour energy and CEO of its parent company. In the doc he presents four simple ideas/inventions that can revolutionize life for billions of people. It's free and it's on youtube. I was blown away by it and thought forum members might enjoy it as well.
It focuses on energy, water and health.