http://blog.ted.com/2010/12/02/nasa-finds-arsenic-based-life-a-tedtalks-playlist-for-context/1
What life forms exist beyond Earth?
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Last week NASA scientists announced that arsenic can replace phosphorous in some bacteria.
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Meaning what?
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Living things can exist without phosphorous, previously thought to be essential for existence. Click here for 5 TED talks about how and why we might search for such life forms in space. Click here for an article describing the findings of the NASA scientists.