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No battery? No problem. At Penn, a mini electric car draws energy from its surroundings. Tom Avril, The Philadelphia Inquirer © ALEJANDRO A. ALVAREZ/The Philadelphia Inquirer/TNS The car can steer itself to draw energy from metal surfaces, avoiding nonmetal surfaces such as this yellow tape. The technology also could run generators during power outages. Min Wang placed the miniature electric car on a sheet of aluminum, and immediately despite having no battery the vehicle began to move. Its power supply was the metal beneath it, with an assist from oxygen in the surrounding air. The demo took place in the University of Pennsylvania lab of James Pikul, an assistant professor of mechanical engineering, who watched as Wang, a Ph.D. candidate, picked up the car to adjust its gears. Loosely speaking, it works the same way animals oxidize food to get energy, except the fuel is metal.

University of pennsylvaniaUnited statesYue gaoMinhal dhanjyKevin chenJames pikulJohns hopkins universitySingh centerMassachusetts institute of technologyPhotograph in pikul labIntelligent systemsMin wangPikul labAdvanced intelligentMassachusetts instituteMetal light