>>38
Actually, yes you do. The same way you needed to be an engineer to know that the titanic could sink. You also needed to be an engineer to know that wind would make a suspension bridge move like a flag.
That was not some debris, do you know the weight of the towers? And we aren't talking throwing sand at the building, we are talking some big chunks in cases.
y did they blow up building seven? If it was really an issue wouldn't it make more sence to put anything you wanted destroyed in the 2 towers? I mean it's not like they would have run out of room in them.
If the towers were blown up in the foundation they wouldn't have collapsed from the top. I mean if you blew up the roots of a tree how would it collapse do you think?
Ok, if you were going to blow up the towers and make it look like a terrorist attack what would you need? Presisely placed explosives that would take down the towers while still appearing to be demolished by the attack, also requires percision in explosive mass. Precise placement also requires knowing exactly what level the plane would hit at, what angle, and how much fuel they would be carrying. If the explosive is on a timmer you need to know the exact time the plane will hit.(actually not a very difficult thing as all flights left on time that day), most likly if they were used it was a remote detonation.
Assuming you have all of this: Why not blow up and collapse the building minutes or even seconds after the planes hit?