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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.