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/artic...
http://health.howstuffworks.com/skin-...
http://health.howstuffworks.com/skin-...
http://www.ncbi.nlm.nih.gov/pmc/artic...
http://health.howstuffworks.com/skin-...
http://www.livescience.com/38039-what...