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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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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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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.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.