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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.