content: in b4 WTC7  no water-main service/pressure.  two enormous skyscrappers collapsing might just be enough to cause that. uncontrolled fire with nothing trying to extinguish it, no sprinklers, no firemen...  everything engulfed...  http://www.m4040.com/AssholeFiles/SteelTemp-vs-Yield.gif rivets popping, steel getting so hot its deforming, its not melting, but its 15% of original strength... house of cards