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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Everyone has one nostril that is larger than the other.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.