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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.