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Why is my snot green? How deep are my sinuses? Fascinating facts about mucus, noses and sprays
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Why is my snot green? How deep are my sinuses? Fascinating facts about mucus, noses and sprays

by David King, The Conversation We’re not really sure why we evolved to have sinuses – but they work. Credit: Shutterstock Our noses perform important functions every day of our lives, but we often only notice when disease changes how they work. Our sense of smell works when chemical molecules are sniffed into the nose and make contact with...