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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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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.