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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.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.