University of Michigan engineering students work on their solar car, called Momentum, at Motorola's corporate headquarters April 21 in Schaumburg, Ill. In commemoration of Earth Day 2005, Motorola held an exclusive showing of the car, which will compete against 40 others in the 2,450-mile North American Solar Challenge race that starts July 17 in Austin, Texas.
Credit: Tim Boyle/Getty Images
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