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There are 60,000 miles of blood vessels in every adult human.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.