sources for project 4

http://money.cnn.com/2010/03/24/news/economy/tanning_tax/

http://0-www.nejm.org.helin.uri.edu/doi/full/10.1056/NEJMp1005999

http://www.cbsnews.com/stories/2010/06/30/eveningnews/main6635131.shtml

http://www.salon.com/life/feature/2004/07/28/tanning

http://www.salon.com/life/broadsheet/2009/07/29/toxic_tanning

http://www.salon.com/life/broadsheet/2006/05/18/tanning

http://www.skincancer.org/the-dangers-of-tanning.html