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| How do people use visible light? | |
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| People use visible light to see, to help keep them safe, and to communicate with one another. | |
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| What are x-rays used for? | |
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| X-rays are used in medicine, industry, and transportation to make pictures of the inside of solid objects. | |
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| Ultraviolet rays have applications in health and medicine, and in agriculture. | |
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