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Did you know?
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are 20 feet of blood vessels in each square inch of human skin.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Illicit drug use costs the United States approximately $181 billion every year.