Here in a new short video about the destruction of the Towers in NYC on 9/11. Richard A. Siegel and Randy Penn create a new expression of art and knowledge.
The explosive force of the North Tower as it is pulverized from the inside out is clearly demonstrated. "Popular Mechanics" has described the WTC7 being hit with the "heat and force like a volcano" here is the visual evidence. The North tower explodes off one of the elevator floors and debris is expelled in an upward arch over a football field distance onto the roof of WTC7. An amazing feat for a building if it was just falling.
The stunning video shows clearly upward explosive debris moving up in an arc before crashing into the WTC7.