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Associated Press
Gov. Dennis Daugaard listens as a scientist explains safety protocol Wednesday, May 30, 2012, in the Sanford Underground Research Facility nearly 4,900 feet beneath the earth in Lead, S.D. The lab's experiments will include the world's most sensitive dark-matter detector. Scientists say that the lab _ housed inside the now-shuttered Homestake Gold Mine _ could help scientists understand the origins of the universe. (AP Photo/Amber Hunt)

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