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Did you know?
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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.