A Sony booth staff watches a propeller rotating by electricity ...
AP
Thu Dec 10, 8:06 AM ET
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A Sony booth staff watches a propeller rotating by electricity generated by a prototype dye-sensitized solar cell set on the window panels as the light is casted on them from behind at the booth of Sony Corporation during the Eco-Products 2009, Eco Style Fair, in Tokyo, Thursday, Dec. 10, 2009.

(AP Photo/Shuji Kajiyama)

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