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The human body produces and destroys 15 million blood cells every second.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.