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How Sunglasses Work

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Whether you're hitting the surf or the slopes or just spending a day on the lake, sunglasses are a must-have accessory. Find out if the $10 sunglasses are as good as the high-cost ones.

How Solar-powered Sunglasses Work

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Solar-powered sunglasses could provide a new way to generate electricity. Learn about the workings of solar-powered sunglasses.

Is there a way to make my sunglasses scratch-resistant?

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I recently bought a pair of mirrored sunglasses and they are already scratched. Isn't there a way to make them scratch-resistant?

How have NASA space helmets changed optics?

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How have NASA space helmets changed optics? Visit HowStuffWorks to learn how NASA space helmets changed optics forever.

How Corrective Lenses Work

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Eyeglasses are one of the most common sights in the world. Learn what goes into creating the lenses and how to read an eyeglass prescription.

Could nanocrystals be the next big fuel source?

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Nanocrystals have exciting new potential in energy production. Learn more about the place of nanocrystals in alternative energy on HowStuffWorks.

How Ocean Currents Work

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Ocean currents may be driven by tides, winds or differences in density. Learn how ocean currents affect marine transportation and nutrient cycling.

How Solar Cells Work

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Solar cells use sunlight to produce electricity. But is the 'solar revolution' upon us? Learn all about solar cells, silicon solar cells and solar power.

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