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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
Green tea is able to stop the scent of garlic or onion from causing bad breath.
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.