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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The longest a person has survived after a heart transplant is 24 years.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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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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