Your right yoss to suggest planes didn't hit the towers is ridiculous. I don't buy into the laser weapons theory either. But I don't believe that the damage from the planes is what causes the towers to fall
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_Posted using RoarFEED 2012_
Okay well that's up to you. There are some excellent reviews of what happened by engineers though. Not government people or people pushing an agenda, just academics studying the evidence.
To quote Bazant and Verdure
The combination of seven effects— 1 Overstress of some columns due to initial load redistribution; 2 overheating due to loss of steel insulation; 3 drastic lowering of yield limit and creep threshold by heat; 4 lateral deflections of many columns due to thermal strains and sagging floor trusses; 5 weakened lateral support due to reduced in-plane stiffness of sagging floors; 6 multistory bowing of some columns for which the critical load is an order of magnitude less than it is for one-story buckling ; and 7 local plastic buckling of heated column webs—finally led to buckling of columns Fig. 1 b . As a result, the upper part of the tower fell, with little resistance, through at least one floor height, impacting the lower part of the tower. This triggered progressive collapse because the kinetic energy of the falling upper part exceeded by an order of magnitude the energy that could be absorbed by limited plastic deformations and fracturing in the lower part of the tower.