JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Automotive X Prize competition. Electric cars competing in the Progressive Insurance Automotive X Prize of 10 million US dollars for super fuel-efficient cars. From left: the Li-ion Motors Wave II battery electric car; the TW4XP battery electric car; the Aptera 2e battery electric car. Photographed on 26 July 2010, at the Michigan International Speedway, Brooklyn, Michigan, USA.
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