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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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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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There are more nerve cells in one human brain than there are stars in the Milky Way.