NASA scientists have discovered mysterious bacteria that can live on arsenic. It is the first organism able to substitute one of the six chemical elements crucial to life (carbon, hydrogen, oxygen, nitrogen, sulphur and phosphorus)."This is just a weird branch on the known tree of life," said Paul Davies, the Arizona State University and Nasa Astrobiology Institute researcher. "We're interested ultimately in finding a different tree of life... that will be the thing that will have massive implications in the search for life in the Universe.
The following video talks about the discovery ( I hope you understand more or less).
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