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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cyanide works by making the human body unable to use oxygen.