| X-rays can pass through many objects |
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| The first images Wilhelm Roentgen took |
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| With X-ray machines doctors can find out |
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| X-rays show hard objects of your body |
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| Scanners are used to produce |
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| People who operate x-ray machines |
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| Doctors use x-rays |
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| X-ray telescopes are used |
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| Factories use x-rays |
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| Airport security uses x-ray machines |
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