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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.