[roylene]

All I can tell you is this, my husband is an engineer, he marveled (thinking the terrorist actually knew what they were doing) at the brilliance of hitting the buildings where they did, with a plane full of fuel. He went on in detail about the physics involved, I think my eyes glazed over after a few minutes. If I can remember in a nut shell the planes hit, fuel caused great heat and the buildings began to collapses under their own weight.

[WhiteGuy]

"the planes hit, fuel caused great heat and the buildings began to collapses under their own weight."

Yes, I understand this explanation as well...........