PM on Radio 4 reported this story yesterday (Wednesday 17 July). Researchers at the University of the West of England have invented a method of charging mobile phones using urine. The report said that the quantity of one bladder of urine could charge a phone to give full use – minutes, texts, internet use etc – for 24 hours.
“The beauty of this fuel source is that we are not relying on the erratic nature of the wind or the sun; we are actually reusing waste to create energy. One product that we can be sure of an unending supply is our own urine.”
Dr Paul Ioannis Ieropoulos,Engineer at the Bristol Robotics Laboratory where the fuel cells were developed.
http://www.science20.com/news_articles/urinepowered_mobile_phone_developed-116562