Hey Buddy: What Brought WTC7 Down?

Of the many mysteries surrounding 9-11, few have been of as much interest to as broad a range of people as the fate of World Trade Center 7, the 47-story office building that was the last to fall and appears to have been the first steel-framed skyscraper to collapse due solely to fire. The National Institute of Standards and Technology, which this fall issued its final report on what happened to the Twin Towers, was supposed to report on WTC 7 at the same time. But that got pushed to December, then to this spring, and lately to the end of 2006. Now, NIST is soliciting a contractor to try to come up with the best explanation for why the building came down.