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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The human body produces and destroys 15 million blood cells every second.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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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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.