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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 the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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There are more bacteria in your mouth than there are people in the world.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.