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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.