As I understand it, the construction of a skyscraper looks like this:
The supports, whether made from steel, platinum or quantum particles (TM), are constructed to withstand substancial, but not indefinite pressure in the height. As such it is a highly complicated puzzle, kind of like creating a house of cards.
As any ever having constructed one of these will know, all it takes is one missing support and the entire thing collapses. DOWNWARD!
Now let's have a look at the events of 9/11 (which i saw live on television and which probably cost me one of my more remote email buddies all though I never knew her real name and so never can be entirely certain even if her emails went dead arround that time. Conspiracy?) shall we?
The supports of the twin towers were constructed in sections to bear a certain amount of pressure (measured in metric tons arround these parts) downwards. This can be seen in the "pyramid" patterns of the beams in the black and white photo found in post 15 of
this thread which serves to strengthen the supporting (please notice this word, conspiracybeliver) skeleton by spreading the pressure in the beams over a greater area than the supports (again that word) individually covers.
Each floor is "hung" from these supports and several interfloor supports helps in spreading the pressure evenly. Again a word you should notice "Evenly".
Now lets pretend someone, say a maniac taleban leader born in saudi arabia and with the worlds worst beard not to mention a mission to prove the west that he can hit them anywhere he wants in an attempt to make them give in to his demands, decides to ram the building from the side with a fully fueled and loaded aircraft, then what would happen?
At this point, I suggest a pratical demonstration. Take 5 beercans (or sodacans if you, as I suspect, are under the legal age of consumption of alcohol) and place four of them in a square with the last dead center. Now put a piece of plywood on top of them and stand on it directly above the center can. Then have your little buddies remove the 4 "corners".
If you have done this correctly, and stands still, you should still be standing a cans height over the ground on a piece of plywood. This is the priciple behind support beams: They support your weight by distributing the weight.
Now have one of your buddies deform the can with a poker or a long metal rod. This would be the airplane.
See what happens? You fall down.
That is, roughly, what happened with the towers.
The plane that our not so theoretical terrorist from Afganistan via Saudi Arabia deformed the support system of the tower and moved the balance point of the bulding. Due to the construction of the building, the thing kept up for a while, but continious fires inside the building, as illustrated by the billowing collumns of smoke coming out through that rather big hole in the side, which also supplied the fires with oxygen, softened/melted what was left of the support system (that word again) of the building. This, combined with the skewed, and highly added weight, of the already collapsed floors caused the building to collapse into itself.
The balance point of the building were only marginally skewed, which explains the "telescope" movement, but it was skewed as a closer scrutinasation of the original tapes from that day will testify to.
This skewing of the balance point of a construction is also why it's dangerous to be inside a badly constructed building during an earthquake. Ever seen broadcasts from some of the big earthquakes? Noticed how the building have in many instances collapsed inside itself?
This is the reason.
ETA: Spelling.. Bearcans indeed....