NASA's announcement today of the discovery of bacteria from Mono Lake, California, that can use arsenic in its body instead of being poisoned by it, is significant to the search for life on other worlds. Not only do these organisms live in an extreme environment -- but they are also an extreme life form.
If we can find such an extreme combination on Earth, what may have evolved in alien environments elsewhere?
Bill Nye, the Planetary Society's Executive Director, said:
"If you or I ingest arsenic, well... it doesn't go so well. So, if we can discover arsenic-loving bacteria right under our noses in such a well-researched place as Mono Lake, who knows what else is out there, on our world or somewhere far, far away?"