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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Excessive alcohol use costs the country approximately $235 billion every year.
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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.