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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.