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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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The human body produces and destroys 15 million blood cells every second.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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.