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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 most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.