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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.