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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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 the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.