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Did you know?
Everyone has one nostril that is larger than the other.
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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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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.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Vaccines prevent between 2.5 and 4 million deaths every year.