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Visible ligth rays can be harmfull to your eyes.

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Light waves can also be made using a laser.

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We've evolved to make use  of these particular wavelenghts.

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We use light to see things.

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a light bulb works by getting heated up to around 3,000 degrees and glows white and hot.

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The surface of the sun is 5,600 degrees and gives off a great deal of light.

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They are made by anything that glows.

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Are these light rays visible?

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They are light rays you can see.