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May 31, 2012
http://www.sciencedaily.com/releases/2012/04/120418143759.htm#.T8bCyNjCy3M.facebook
May 31, 2012
http://www.nytimes.com/2011/03/15/science/15why.html?pagewanted=all%3Fsrc%3Dtp&smid=fb-share
May 31, 2012
http://www.sciencedaily.com/releases/2011/08/110811084513.htm#.T8a-ulM4QDQ.facebook
May 31, 2012
http://www.nytimes.com/2009/03/17/science/17whal.html?pagewanted=all%3Fsrc%3Dtp&smid=fb-share