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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The longest a person has survived after a heart transplant is 24 years.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.