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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 more nerve cells in one human brain than there are stars in the Milky Way.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.