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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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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.