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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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.