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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.