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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
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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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There are 60,000 miles of blood vessels in every adult human.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.