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Thyroid conditions may make getting pregnant impossible.
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The horizontal fraction bar was introduced by the Arabs.
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There are more bacteria in your mouth than there are people in the world.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.