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(Denver, Colo., September 15, 2004) Portrait of Geologist Michael Kunk in front of the Geological Survey TRIGA Reactor, a research nuclear reactor, at the Denver Federal Center in Denver, Colo., on Wednesday, September 15, 2004. Kunk utilizes the reactor for potassium argon dating of rocks and minerals. (Photo by CHRIS SCHNEIDER/ROCKY MOUNTAIN NEWS)

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