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SPECIAL COVERAGE: Living With Wildfires: San Diego Firestorm 10 Years Later

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The Aniakchak caldera in Alaska. Only Thermophilic bacteria can survive in this environment, feeding essentially on sulfur that they transform into organic matter.

Above: The Aniakchak caldera in Alaska. Only Thermophilic bacteria can survive in this environment, feeding essentially on sulfur that they transform into organic matter.