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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.