Fed. agency: 'New phenomenon' caused WTC 7 collapse

rawstory.com — Metal expanding due to heat -- aka "thermal expansion" -- is a "new phenomenon," according to the National Institute of Standards and Technology. Yet their report on how World Trade Center 7 mysteriously collapsed is drawing criticism from a large group of professional architects and engineers, who want to know what the agency is covering up. Aug 21, 2008 View in Crawl 4