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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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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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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.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Medication errors are more common among seriously ill patients than with those with minor conditions.