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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.