It's estimated that around 2.6 billion people around the world make do without any sanitation, including more than 10 million in the slums of Kenya. Still more have to use thinly disguised holes in the ground. A group of MIT students have joined forces to try and create a sustainable toilet solution for those in need. They've developed a low cost, modular sanitation solution which would be operated and maintained by locals and the waste transported to nearby processing plants. Biogas produced from the waste will be used to create electricity and what's left of the human waste turned into fertilizer.