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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The average office desk has 400 times more bacteria on it than a toilet.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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There are more sensory neurons in the tongue than in any other part of the body.