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There are more sensory neurons in the tongue than in any other part of the body.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.