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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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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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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.