Why Don't Haircuts Hurt?

Jessi is getting a haircut later, but what makes it so that your hair doesn't hurt when you go to get it cut?

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SOURCES:

http://kidshealth.org/en/kids/brain.html
http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?id=2612&np=152&p=335
https://askabiologist.asu.edu/explore/how-do-we-feel-touch
http://www.biology-pages.info/M/Mechanoreceptors.html
http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=152&id=2726