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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.