by Darren Wumoult Each time you take in a deep breath, air is not the only thing that enters your nose, especially if you live in modern urban areas. Microscopic particles of dust, bacteria and other matters floating in the air are sucked into your nose as well. These foreign objects are filtered by the mucus in the nasal cavity and barred from entering your lungs. Instead, these foreign particles, together with the mucus, are pushed all the way back until you swallow them. In the stomach, the

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