Official Explanations Cannot Explain Total Collapses of Any Type

These explanations cannot begin to explain any kind of total collapse.
(If damage due to impacts and fires were sufficient to cause some kind of collapse, it would have caused the tops to topple like trees, leaving the structures below the impact zones standing.)

The newly discovered ability of buildings to crush themselves is given the term progressive total collapse.
Take THE PROGRESSIVE COLLAPSE CHALLENGE !

Official theories are even less able to explain the features of the collapses revealed by the surviving photographic and video evidence.