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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.