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Convention Center, Shanghai, China. Xinzheng / Getty Images

By Marlene Cimons

The windows of many cars and buildings often are tinted with a film that shuts out unnecessary sunlight, an energy efficiency measure that helps lower heating and cooling costs. Other types of environmentally friendly windows feature a coating of see-through solar cells that transform the windows into mini generators of electricity. But you probably won't find any windows anywhere that can do both. Not yet anyway.

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