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First time a fire caused the total failure of a skyscraper

Experts with the National Institute of Standards and Technology conducted a 3-year investigation into the collapse of WTC 7, a 47-story steel and concrete structure. They said it was the first time in the world that a fire caused the total failure of a skyscraper. Here, a worker stands before the remnants of WTC 7 two days after the attacks.

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