Why do I have boogies and why does my nose keep replicating them? – Duncan, aged seven, Sydney, Australia.
Boogies, bogeys or even boogers – whatever you call them, the little bits of dry snot (or “mucus”) that form in your nose actually help protect you from harm.
Your nose makes mucus to help collect the tiny dust and dirt particles in the air you breathe, to stop them getting into your lungs.
The mucus also contains special molecules (with interesting names like “immunoglobulins” and “enzymes”) that help protect you against infection or break down the dirt that you pick up from the outside air.
Mucus is usually runny, but since you breathe through your nose (as well as your mouth) the air flowing through it will dry out some of the mucus and dirt. That’s what forms the little nuggets at the front of your nose you call “boogies”.