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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.