Fuel cell robot
Drew Rodgers (left), a mechanical engineer at the Naval Research Laboratory, shows the Ion Tiger to John Holdren (bearded, on right), the director of the White House Office of Science and Technology policy. The Ion Tiger is a hydrogen-powered fuel cell unmanned aerial vehicle.
April 3, 2012 10:57 AM PDT
Photo by: Naval Research Laboratory
| Caption by: Martin LaMonica
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