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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.