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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.