?? what? certainty about "NAPALM"??? I hope that's not what you meant.

Carol...on the link you posted..did you click on all the series of explanations in the USA Today links? They make it pretty clear. There was way more than just "steel vertical members" withing the core...there were concrete slabs AND structural mambers connected to the outer perimeter!

Would you like to have the challenge of designing a building with concrete slabs, operating as a unit, that would NOT bring down the vertical members when the roof & many concrete floors (that WERE connected to them)started coming down?

It is not my job to "prove you wrong"! The buildings DID collapse as the structural report says...if you, or anyone with **engineering competence, feels that something else contributed to the fall, it is your/their job to 'prove' how. So far, the official report fulfills the physical explanation, except to those who just look at it and refuse to accept it....it doesn't have to juggle the myriad of wierd hypotheses one has to assume to construct an "inside job" conspiracy!

The rule is, (and it is serious and profound..) "From false premises, anything follows"...even BBs aliens.