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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.