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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Asthma cases in Americans are about 75% higher today than they were in 1980.