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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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There are more sensory neurons in the tongue than in any other part of the body.
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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.