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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The horizontal fraction bar was introduced by the Arabs.
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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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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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Vaccines prevent between 2.5 and 4 million deaths every year.