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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.

