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Since your body is already pretty good at healing itself, does icing an injury actually help?

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Why Are Paper Cuts So Painful: https://www.youtube.com/watch?v=sK4b-m00OlQ
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Sources:
http://emj.bmj.com.proxy.libraries.rutgers.edu/content/25/2/65.full
http://journals.sagepub.com/doi/pdf/10.1177/0363546503260757
http://www.webmd.com/arthritis/about-inflammation#2
http://www.sportsinjurybulletin.com/archive/1066-cryotherapy.htm#
http://emj.bmj.com.proxy.libraries.rutgers.edu/content/25/2/65.full#ref-20
http://www.sportsinjurybulletin.com/archive/1066-cryotherapy.htm#
http://bjsm.bmj.com/content/41/6/365
http://www.nature.com/articles/srep18525
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2290674/