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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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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.