Scientists have discovered a form of bacteria that can thrive on arsenic -- an element generally considered toxic -- dramatically expanding both traditional notions of how life is sustained and the range of where it might be found in the universe, NASA funded-researchers said Thursday. "Life as we know it requires particular chemical elements and excludes others," Arizona State University researcher Ariel Anbar said in a news release. "But are those the only options? How different could life be?"
Actually the bacteria incorporates the arsenic into its DNA, this is the most startling part. This will alter what we have perceived as 'means for life'.