Weihl explained how prototype photovoltaic panels from Energy Innovations, displayed here in a Google lobby, would use Fresnel lenses and prisms to get 20 watts per square centimeter of solar cell. The panels atop Google's buildings are made by Sharp.
Google.org, the search giant's philanthropic arm, is investing hundreds of millions of dollars toward its goal of making clean energy cheaper than coal.
Google Chrome beta for Mac
It's not fully baked yet, but Google Chrome for Mac reaches a major milestone with the release of an official … Watch it now
How do you build a smarter planet?
Having problems with complex data center? Simplify your data center now.
| Apple iPhone 3GS 32GB | 36 plans |  4% |
| Apple iPhone 3GS 16GB | 36 plans | 1% |
| Apple iPhone 8GB | 42 plans | 7% |
| Sony Ericsson Satio | 12 plans | 1% |
| Blackberry Curve 8520 | 8 plans |  2% |
| Apple mobile phones | 11% |
| Sony Ericsson mobile phones | 1% |
| Nokia mobile phones | 5% |
| Blackberry mobile phones | 2% |
| HTC mobile phones | 2% |
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