"Some 22 universities around the world are working with Gates. The goal is to make a toilet that is robust, easy to clean, water- and energy self-sufficient, and costs a user less than five cents a day. This would be a feat, mixing design, engineering and biochemistry and microbiology. But sanitation and prevailing against diarrhoea must also involve sociology (getting women to help) and better handling of waste for those who do have toilets." (Quoted from article)