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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.