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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.