What Causes Sunburns?

Why does too much sun turn some people’s skin all red and shiny? Quick Questions explains!
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Sources:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3985496/
http://health.howstuffworks.com/skin-care/beauty/sun-care/question637.htm
http://health.howstuffworks.com/skin-care/beauty/sun-care/active-ingredients-in-sunscreen.htm
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2564815/
http://health.howstuffworks.com/skin-care/beauty/sun-care/sunscreen.htm
http://www.livescience.com/38039-what-causes-sunburns.html

Видео What Causes Sunburns? канала SciShow