How is it that in an alleged "progressive collapse" the event as recorded would have required ALL of the structure under the falling upper mass to fail at exactly the same time and to fail totally & completely. Just exactly how is that done? also in addition, how is it that the South Tower strike by an alleged commerical airliner was seen on video to have had the "aircraft" penetrate the building completely and without slowing down at all or for that matter suffering deformation of the "aircraft" by what magic is this sort of thing achieved?
painfully easily given the building design.