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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.