<http://schema.org/about>
"Today's robots that fly, jump or roll around must refuel or recharge as does any gadget that runs out of energy. Tomorrow's new generation of self-sustaining ro"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/gadgets-electronics/stories/waste-powered-robots-the-future-of-machines>