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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The horizontal fraction bar was introduced by the Arabs.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.