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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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Your heart beats over 36 million times a year.
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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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Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.