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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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In 1864, the first barbiturate (barbituric acid) was synthesized.