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        6-12

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        Textual, Visual

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        Part of NOVA
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        Diamonds: The Science Behind the Sparkle

        Light travels at 186,000 mi/sec in a vacuum, but when it travels through other media, its speed may be slower. In this illustrated essay from NOVA, you'll learn how electrons in materials slow light passing through them, causing light to bend—or refract—when going from one material to another. You'll also learn how jewelers trap light to give a diamond its sparkle.

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