[_Jim]

Levine frequently would say that "if a fire breaks out above the 64th floor, that building will fall down."

That explains a lot right there ...

[imberedux]

Bin Laden is a very bright (albeit evil), well educated engineer. I'll bet he read thos words many times. This has been planned for years.

[po'boy]

I wonder how many people have been around when concrete explodes from too much heat.

In addition to all else if those floors were poured concrete then that to was an element of the collapse.