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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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Everyone has one nostril that is larger than the other.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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There are 60,000 miles of blood vessels in every adult human.