What caused Building 7 to collapse on 9/11? Dr. Leroy Hulsey from the University of Alaska Fairbanks may have the answer, following an exhausting four year engineering study.
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The Orchard
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1091 Pictures
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Overview：What caused Building 7 to collapse on 9/11? Dr. Leroy Hulsey from the University of Alaska Fairbanks may have the answer, following an exhausting four year engineering study.
