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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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.