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There are 20 feet of blood vessels in each square inch of human skin.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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In 1864, the first barbiturate (barbituric acid) was synthesized.