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Did you know?
There are more bacteria in your mouth than there are people in the world.
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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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Cyanide works by making the human body unable to use oxygen.
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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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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.