Mono Lake tufa towers are seen in this Monday, Nov. 15, 2004, file photo near Lee Vining, Calif. The discovery of a strange bacteria that can use arsenic as one of its nutrients widens the scope for finding new forms of life on Earth and possibly beyond. But the researchers found that the bacteria, discovered in Mono Lake, California, is able to continue to grow after substituting arsenic for phosphorous. (AP Photo/Ben Margot,File)
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