Wireless Japan 2010 [Getty Images]

An NTT DoCoMo Inc. employee shows the company's FOMA eco solar panel 01, solar-power battery charger for mobile phone, at the Wireless Japan 2010 in Tokyo, Japan, on Wednesday, July 14, 2010. The expo for mobile phone technologies will be held through July 16. Photographer: Kimimasa Mayama/Bloomberg via Getty Images

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