Dave Heller of Berkeley, California wrote:
Jose-

The final NIST report released in Oct. 2005 states that the steel they tested from the impact zone did not get above 200 degrees centigrade (about 450 degrees F). Your oven can get hotter than that. That temperature isn't even close to weakening the steel.

There are also photos and videos of a woman standing in the impact hole of one of the engines in WTC1. How could she have survived fires hot enough to weaken steel? How could she even be standing in that hole if the steel was heated to 2000 degrees F?

If the South face of WTC7 was damaged and created fires to weaken the steel, why did the building collapse symmetrically? How come almost every window on the North side remained intact? Could those windows have resisted shattering in heat intense enough to weaken structural steel to the point of collapse?