http://www.sciencedaily.com/releases/2007/06/070606113456.htm (http://www.sciencedaily.com/releases/2007/06/070606113456.htm)
which is excerpted from:
http://www.plosone.org/article/fetchArticle.action?articleURI=info:doi/10.1371/journal.pone.0000509 (http://www.plosone.org/article/fetchArticle.action?articleURI=info:doi/10.1371/journal.pone.0000509)
I would give you guys a quiz but I wouldn't know how to write the questions.
Sincerely,
Brendhan