That's the point which stands out for me the most. The planes hit near the very top of the towers, and when they collapse you see the section above the impact site fall down first, and supposedly the weight of this crushed the rest of the tower. Is that enough to decimate the rest of the building so completely? If so, would it at least have not have collapsed so perfectly? Especially footage of the south tower shows the whole top section leaning on an angle as it begins its descent, yet it drops perfectly vertical. It doesn't seem right that a plane hitting one side of the building and a fire spreading randomly would cause a uniform collapse. Unless the damage was spread evenly around the building, it should collapse unevenly.Quote:
Can that happen if there are obstructions to the collapsing floors on the way down?
However, perhaps with the immense weight involved it simply gains too much momentum to fall to the side. Imagine having a jenga tower and then pulling some blocks out of one side - its going to fall over at an angle. But if the weight was enough maybe it would just implode straight down on itself.
The official explanation for the puffs is compressed air forcing itself outwards due to the collapsing debris above. This is questionable due to it being dust and debris that is being expelled, not just air, but maybe the air compression would force out a bunch of material with it.Quote:
The other thing I noticed are puffs of what looks like dust or smoke coming out of the windows at least 10-20 stories below where the floors are beginning to collapse