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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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There are 20 feet of blood vessels in each square inch of human skin.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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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.