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[personal profile] demonicgerbil
http://www.slate.com/id/2276919/pagenum/all/

Using arsenic instead of phosphorous is a pretty big deal in DNA. And if you look read that article from Slate, you can get a sense of all the counter-arguments against NASA's announced discovery. Hm. I just noticed I never linked the original article here in LJ. You can read the abstract here or I'm sure google it p