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Why do we have boogers?

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Sources

  • KidsHealth.org. "What's a booger?" July 2012. http://kidshealth.org/kid/talk/yucky/booger.html
  • Watson, Stephanie. "The Truth about Mucus." WebMD. April 10, 2014. http://www.webmd.com/allergies/features/the-truth-about-mucus

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