I find it rather incredible that anyone thinks the kinetic energy, and momentum imparted, by a jet liner full of fuel into one of those towers somehow "requires" an outside force.
To quote Ripley in Aliens, "Did IQs sharply drop while I was away?"
The only "evidence" that suggests it was something other than two planes ramming two towers is laughably tenuous, like, "Oh, we found *molten steel girders*." (Hello! The photos show a steel girder glowing red-orange, as in *heated by a few hundred Kelvins*. If we were dealing with a MELTED girder, the image would show mostly steam and only a brief glimpse at a WHITE-hot girder rapidly disintegrating.)
I challenge any conspiracy theorists to debate the matter with mechanical engineer Michael Wong at stardestroyer.net. Yeah, stardestroyer, hahahaha, so Wong's a a geek, hurfdurf

That "geek" will also eat your fucking lunch. If you can even hold your own with him I'll give you mad props

-S
P.S. -- 240/Rob, I'm looking at you, bro. I know you buy that Rosie O'Donnell bullshit or similar ilk. You're a sharp guy ... take it up with Mike or his forum members. They'll fix that "inside job" shit for you in short order, my friend
