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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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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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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The horizontal fraction bar was introduced by the Arabs.