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@WillRavel:
You need to watch one of several History Channel / TLC / PBS documentaries to answer many of your questions.
One that I can answer for you is your question as to why the south tower fell 1st. It fell first because it was hit lower. There was more weight above the point of failure (the floors which had burned). This meant that fewer beams had to fail before it reached a critical point and the entire structure failed.
Where did you get your 50 ft/sec # on the rate of the dust ?
Where was building 7 supposed to collapse if not on itself ? I mean the twin towers are fairly close and the south tower went down straight pretty much. The north tower didn't go down because the south did.
How do you know what the temperature of the fuel fire was ? There were other burnable items in the building, furniture/carpets.
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