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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.