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Viscous colloidal mucus or if it is not wet, then dried nasal mucus is the name for what we call 'snot'. As to why: any body system that has an opening to the outside of the body has this as a protection for drying out. The system would just not work otherwise. Even the eye sockets have this mucus forming protection. May be you noticed dried 'stuff' around your eye rims when you have taken a decongestion for a cold.

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9y ago

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