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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.