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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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The horizontal fraction bar was introduced by the Arabs.
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The average office desk has 400 times more bacteria on it than a toilet.
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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.