After conquering the computer world, Microsoft's Bill Gates is working on the Third World.
He's passionate about the Janicki Omniprocessor, which turns sewer sludge into electricity, clean drinking water and ash. Waste is a hazard is third-world contries, which also suffer from polluted or little water.
At the moment, the Janicki Omniprocessor is being used in a pilot project in Senegal. Gates would like to see the idea spread across the developing world to reinvent the sewage treatment plant. Most modern plants don't use the waste as energy, but instead store the dried human waste in deserts and are powered by diesel or some other non-renewable energy source.