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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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The human body produces and destroys 15 million blood cells every second.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood is approximately twice as thick as water because of the cells and other components found in it.