Robots of the future may be fueled by pee. Yes, pee.

Robotics engineers have constructed a new device that can pump human waste into the "engine room" of a self-sustaining mechanical system, which employs a team of live microorganisms to digest the organic matter, in the process generating electricity to power the machine.

A recent test of the system used microbial fuel cells, powered by urine, to charge a mobile phone. (See video below.)

Future applications of the system, the researchers contend, could be used in the new generations of more advanced "EcoBots."

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