Did Bacteria Fuel World's Worst Extinction?

LiveScience.com
Did Bacteria Fuel World's Worst Extinction?
Nickel-eating bacteria may have worsened the mass die-off some 250 million years ago, scientists suggest. (Shown here, International Space Station astronaut Ron Garan captures one of the 16 sunrises they see each day, on Aug. 27, 2011.)
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