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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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There are 60,000 miles of blood vessels in every adult human.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.