Got your finger up your nose? (We hope not!) If you do, you can probably feel a
booger. Boogers are made of dried
mucus, dust, pollen, and dirt.
They can be squishy or hard, but they do an important job — they help keep that
bad stuff from getting into your lungs. Since boogers are full of germs, it's a good
idea not to pick them (blow them out into a tissue instead).