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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.