Why Do Bug Bites Itch?

Hank explores a vexing question asked at picnics and beach parties everywhere: Why do bug bites itch? To help you understand the answer, he takes you into the blow by blow of a bug bite which, we warn you, is pretty horrifying.
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Sources:
http://www.cdc.gov/niosh/topics/insects/
http://phenomena.nationalgeographic.com/2013/08/06/heres-what-happens-inside-you-when-a-mosquito-bites/
http://www.astrographics.com/GalleryPrintsIndex/GP2108.html
http://www.news-medical.net/health/What-is-Histamine.aspx
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2519061/

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