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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.