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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.