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Vaccines prevent between 2.5 and 4 million deaths every year.
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There are 20 feet of blood vessels in each square inch of human skin.
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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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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.