"Fell Onto Itself"
This one is easy. It most certainly did not.
http://www.debunking911.com/b7debris.jpg shows how the tower collapse was extremely messy. Fell all over neighboring streets.
One of the most convincing "reason" I have heard for what caused the collapse is that the fire weekended the structural columns under the east penthouse, and it fell first. If you watch the videos, you can see that this is indeed how the building fell--the east penthouse caving in first, then the rest of the building. See this video : http://youtu.be/CLHwvwJCmgk (it also shows the length of time it took for the entire thing to collapse).
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