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...describe these organisms as hardy would be an understatement. The Dry Valleys are so cold (the mean annual temperature hovers around -5ºF) that glacier-fed streams run no more than six weeks a year, and so arid that what little snow falls turns to vapor almost overnight. Scientists recently reported, however, that sequestered in the 60 ft. of ice that covers one of the largest Dry Valleys lakes, Lake Vida, are dormant but still viable bacteria that have been sealed off from the outside world for some 3,000 years...