This is bacteria stain GFAJ-1 of Halomonadaceae. And here is the reason it's pretty cool. If you don't want to read all that here's the short version but it's a gross generalization: All life we've ever known has been carbon based. They just found a life form that is arsenic based. This means two things: We have discovered a new form of life on Earth. That out there in space the potential for life just expanded hugely, because we now have definitive proof that organisms exist that can thrive in "unearthly" conditions.
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