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).
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