Booger Keychain

Dried nasal mucus is what we call boogers. Mucus is a slimy goo vital to your immune system. In your nose, mucus catches wayward microbes and other foreign particles before they reach your lungs. When a cold invades and stuffs up your nose, dead viruses get stuck in the mucus turning it from clear to green. So that dripping snot is escorting out unwelcome microbes. And when mucus dries out, hardens, and sticks in your nose, you’ve formed boogers!