This is an exploding building. This is not a collapse. Care to refute this fact? You can't.
Nanothermite has been found in the WTC dust.
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A spout of orange molten metal seen just before the South Tower's fall in videos of the Tower's north face around the crash zone
Reports of molten metal in the remarkably hot rubble of Ground Zero
High levels of metals found in aluminothermic incendiaries -- such as manganese, zinc, and barium -- in samples of World Trade Center dust
Remains of the Towers' structural steel showing severe corrosive attack involving sulfur
An iron-rich sphere found in dust form the Twin Towers. The solidified droplet indicates temperatures in excess of the melting point of iron (2795ºF).
Minute solidified droplets of previously molten iron in samples of World Trade Center dust
Pieces of active nano-engineered aluminothermic chips in samples of World Trade Center dust