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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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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.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.