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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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There are 20 feet of blood vessels in each square inch of human skin.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.