Why are we Ticklish?

What’s up with ticklishness? And are other animals ticklish, too? Quick Questions has the answers!

Hosted by: Hank Green
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Sources:
http://www.americanscientist.org/my_amsci/restricted.aspx?act=pdf&id=3098542719473
http://www.ncbi.nlm.nih.gov/pubmed/14699372

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