WASHINGTON, DC - DECEMBER 02: (L to R) Felisa Wolfe-Simon, NASA astrobiology research fellow, speaks while flanked by Mary Voytek, NASA director, Astrobiology Program, Steven Benner, distinguished ... more 
WASHINGTON, DC - DECEMBER 02: (L to R) Felisa Wolfe-Simon, NASA astrobiology research fellow, speaks while flanked by Mary Voytek, NASA director, Astrobiology Program, Steven Benner, distinguished fellow Foundation for Applied Molecular Evolution and Pamela Conrad, astrobiologist, NASA's Goddard Space Flight Center, during a news conference at NASA Headquarters to announce a finding a potential new form of life on December 2, 2010 in Washington, DC. Wolfe-Simon said that after a two year study at Mono Lake in California, she found that a bacterium that could eat and grow on arsenic instead of phosphorous, one of the basic building blocks of life. (Photo by Mark Wilson/Getty Images) less 
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Getty Images | Photo By Mark Wilson / Getty Images
Sun, Dec 5, 2010 12:03 PM EST