WASHINGTON, DC - DECEMBER 02: Felisa Wolfe-Simon, NASA astrobiology research fellow, speaks during a news conference at NASA Headquarters to announce a finding a potential new form of life on ... more 
WASHINGTON, DC - DECEMBER 02: Felisa Wolfe-Simon, NASA astrobiology research fellow, speaks 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 California lake, 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 2:44 PM EST