Oh I don't know... maybe because an airplane didn't slice through it and dump thousands of gallons of burning jet fuel on it.
Didn't you follow the conversation? Alex and I already discussed this. I see that woofer gave you an explanation of how the jet fuel burned up rather quickly but I was specifically speaking about building 7 where NO plane and NO jet fuel hit it, yet it collapsed and become pulverized just like the other two towers but a very hot fire that burned for several hours at the trade center in 1975 did no such thing. What's YOUR explanation for how that happened?