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There are 60,000 miles of blood vessels in every adult human.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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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.