Truthers falsified

Yet again:

A new mathematical analysis of the collapse of the World Trade Centre has been published by a Cambridge University academic, with results that challenge conspiracy theories surrounding the September 11th attacks.
The new paper, by Dr Keith Seffen, uses established engineering models to demonstrate that once the collapse of the twin towers began, it was destined to be rapid and total.

Not that it'll make any difference. Not even Osama bin Laden telling the world he was behind it, and playing martyrdom tapes from the terrorists involved, has dented their idiocy.