How did the towers collapse?

I did something probably considered to be politically incorrect, which might happen easier during the after hours of club meetings.

I aired my some questions about 911, and was thus very fast classified as conspiracy nut. Stephen had at least the fairness to refer me to wikipedia to find out why how the WTC tower collapse, and why and how WTC 7 collapsed.

In fact, there is a wikipedia entry for the Collapse of the World Trade Center, but it doesn't answer the question I raised.

According to the NIST report, which is part of the 9/11 commission report, it took WTC 1 and 2 ten resp. eleven seconds to collapse. This is about the time it takes for an object to drop from the top of each tower to the ground, obstructed in its path just by the resistance of air.

Physically seen, this implies that about 70 floors, which carried uninterfered the same load they used to carry since the buildings were constructed, had effectively the same resistance like thin air.

One of the basic laws of thermodynamics is called conservation of energy. You need energy to transform a physical object, this means energy is transformed while the WTC is obliterated to bits.

The only energy source available, however is gravity. Given just air resistance, it'll take 11 seconds for the top of the tower to hit the ground. The destruction of the lower floors requires energy, and would therefore transform the gravitational energy. The collapse would have to be slowed down.

However, we know that the more than 70 floors build by steel, filled with desks, chairs, computers, cabinets, maybe even safes, posed no resistance at all to the collapse of the building.

The account given by NIST offers no explanation for the speed in which the Twin Towers collapsed, and it avoids offering any theory at all when it comes to WTC7.

WTC7 collapsed on the afternoon of 911, and too smaller fires and no apparent impact from debris were visible. This 47 storey building collapsed in less than 7 seconds, without any plane hitting it.

Today a plane hit a NY building, and even though you had 50 storey building, hit by a plane and with raging fires, it didn't collapse. WTC7, not hit by a plane, with less raging fires, fell neatly in its footprint, in less than 7 seconds.

I'm not too sure about the amount of science students in the PIS, but anyone with sufficient background knowledge can earn 1 Million US$ by proving the feasability of the theories in the NIST report.

However, the only conclusion I draw from the knowledge that the 911 commission report told some bold lies is that a more thorough investigation about this event is required.

It took the Bush regime more than a year to start any investigation of 911, and before the report was published two wars were already waged. I could make up a nice conspiracy theory up for you, but I'm only interested how the building collapsed.

The available evidence, as for example scrutinized by Scholars for truth, suggests strongly the use of explosives to bring down the building. This surely raises a bunch of other questions, and none of them offers to many reassuring answers.

However, I don't mind if you prefer labelling me as a conspiracy nut rather than trying to convince me (or make up your mind). Yet, the last tyranny on German soil ended just in 1989, and a way too familiar stench is wafting over from the US.

But I'm really curious if you manage to come up with an explanation, how the buildings collapsed so fast without the use of explosives.