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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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There are 20 feet of blood vessels in each square inch of human skin.
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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.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.