The nose produces more than 100 millilitres of snot over the course of a day (less during sleep) and uses it to treat and filter the air we breathe.
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A study that finds good sex gets rid of nasal congestion is definitely worthy of careful appraisal.
The parts of the brain that get ‘smell signals’ from the nose also do other things, such as storing memories or provoking emotions. That is why some smells can bring back old memories.
A reader wants to know why our noses run just because it’s cold.
