To explain the unanticipated free-fall collapses of the twin towers at the World Trade Center on September 11, 2001, mainstream experts (also see The American Professional Constructor, October 2004, pp. 12–18) offer a three-stage argument: 1) an airplane impact weakened each structure, 2) an intense fire thermally weakened structural components that may have suffered damage to fireproofing materials, causing buckling failures, which, in turn, 3) allowed the upper floors to pancake onto the floors below.
Many will nod their head, OK, that does it and go back to watching the NBA finals or whatever, but I find this theory just about as satisfying as the fantastic conspiracy theory that "19 young Arabs acting at the behest of Islamist extremists headquartered in distant Afghanistan" caused 9/11. The government’s collapse theory is highly vulnerable on its own terms, but its blinkered narrowness and lack of breadth is the paramount defect unshared by its principal scientific rival – controlled demolition. Only professional demolition appears to account for the full range of facts associated with the collapses of WTC 1 (North Tower), WTC 2 (South Tower), and the much-overlooked collapse of the 47-story WTC building 7 at 5:21 pm on that fateful day.
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