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There are 60,000 miles of blood vessels in every adult human.
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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.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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.