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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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Blood is approximately twice as thick as water because of the cells and other components found in it.