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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.