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By Sarah Hoffman, Natural History Magazine
posted: 28 March 2009 10:26 am ETOn a submersible dive off the Bahamas, Mikhail V. Matz of the University of Texas at Austin and several colleagues were seeking big-eyed, glowing animals adapted to darkness.
Yet as they cruised above the seafloor, the team was distracted by hundreds of bizarre, sediment-coated balls the size of grapes. Each sat at the end of a sinuous track in the seafloor ooze. Indeed, the balls appeared to have made the tracks; some