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Ive been looking for this article for some time now. Finally found it after a quick email to a very helpful gentleman (I use the term "gentleman" loosely here  ) spurred my thought processes. Hers a popular science article....there are quite a few of them, but Ill post one.http://space.newscientist.com/article/dn11909-did-a-comet-wipe-out-prehistoric-americans.htmlMany thanks to the gentleman(?) for jogging my increasingly strained memory!