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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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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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.