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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are more sensory neurons in the tongue than in any other part of the body.
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The average adult has about 21 square feet of skin.
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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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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.