Scientists Find Bacterium That Survives On Arsenic

National Public Radio: Researchers say they have found a bacterium that defies scientific dogma: It's able to use the deadly poison arsenic in place of an element previously considered essential for life. The finding appears to expand the range of places where life could exist -- both on Earth and elsewhere in the universe. The discovery comes from a young NASA astrobiologist who likes to find exceptions to rules. Felisa Wolfe-Simon says she was fascinated by crustaceans because they don't use iron to carry oxygen around......

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