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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Thyroid conditions may make getting pregnant impossible.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%