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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.