Washington D.C: Normally we flush it down the toilet, but science wise, urine is tipped to be a fuel for the future. At least, that's what this team of researchers thinks, because they've made a pair of socks that uses the liquid to generate electricity.

A pair of socks embedded with miniaturised microbial fuel cells (MFCs) and fuelled with urine pumped by the wearer's footsteps has powered a wireless transmitter to send a signal to a PC. This is the first self-sufficient system powered by a wearable energy generator based on microbial fuel cell technology.