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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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There are 60,000 miles of blood vessels in every adult human.