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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.