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Have you ever wondered how much the electrons that power our car weigh? As I was musing over the properties of our Tesla Roadster electric car the other day I was drawn to the single most massive component of our car which is the battery. This nearly 1000 pound system is composed of various chemicals, enclosures, [...]

(Reuters) - Jim Lentz, head of Toyota Motor Corp.'s U.S. operations, attends the Reuters Autos Summit in Detroit, Michigan September 16, 2008. (Rebecca Cook/Reuters)

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(Reuters) - Jim Lentz, head of Toyota Motor Corp.'s U.S. operations, attends the Reuters Autos Summit in Detroit, Michigan September 16, 2008. REUTERS/Rebecca Cook (UNITED STATES)

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(Reuters) - Jim Lentz, head of Toyota Motor Corp.'s U.S. operations, attends the Reuters Autos Summit in Detroit, Michigan September 16, 2008. REUTERS/Rebecca Cook (UNITED STATES)

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(Reuters) - Jim Lentz, head of Toyota Motor Corp.'s U.S. operations, attends the Reuters Autos Summit in Detroit, Michigan September 16, 2008. REUTERS/Rebecca Cook (UNITED STATES)

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(Reuters) - A map of Toyota Motor Corp's related facilities in the North American continent is displayed as a visitor looks on, at its showroom in Tokyo July 16, 2008. (Issei Kato/Reuters)

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(Reuters) - Jim Lentz, head of Toyota Motor Corp.'s U.S. operations, attends the Reuters Autos Summit in Detroit, Michigan September 16, 2008. (Rebecca Cook/Reuters)

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(Reuters) - A Prius with the new Hybrid engine is seen at the fair stand of Japanese car manufacturer Toyota at the international car show IAA in Frankfurt September 11, 2007. (Alex Grimm/Reuters)

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(AP) - In thgis June 1, 2008 file photo, a lone rabbit passes by a long line of unsold 2008 Scion Xb sedans at a Toyota/Scion dealership in the east Denver suburb of Aurora, Colo. Five years after Toyota Motor Corp. rolled out a hip, inexpensive and fairly fuel-efficient brand called the Scion, sales figures indicate it may be losing some cachet. (AP Photo/David Zalubowski, file)

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