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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The human body produces and destroys 15 million blood cells every second.
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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.