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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.