Factgirl's fact of the day:

Know your nose:

Your nose makes nearly a cupful of snot every day.

When you inhale air through your nose, it contains lots of tiny particles, like dust, dirt, germs, and pollen. Snot works by trapping the particles and keeping them in the nose.

After these particles get stuck inside the nose, the mucus surrounds them along with some of the tiny hairs inside the nose called cilia. The mucus dries around the particles. When the particles and dried-out mucus clump together, you're left with a booger!

Boogers can be squishy and slimy or tough and crumbly. Boogers are a sign that your nose is working properly.

-it's a fact

Sources: How Does Aspirin Find a Headache : An Imponderables Book by David Feldman
               Yucky.com - Snot and Boogers