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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.