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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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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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The longest a person has survived after a heart transplant is 24 years.