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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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 horizontal fraction bar was introduced by the Arabs.