First of all, there has never been a steel framed building collapse from fire in the history the world. World Trade Center building No.7 (1 & 2 were the towers)collapsed at 5pm on 9/11,2001. After burning for 8 hrs. It collapsed without warning to the horror of already stunned onlookers who had to run from the choking debris. It was later admitted on a PBS documentary by Larry Silverstein the leaseholder of the World Trade Center Complex, that WTC#7 was "pulled" the industry term for a controlled demolition because of the fire damage...

"I remember getting a call from the, er, fire department commander, telling me that they were not sure they were going to contain the fire and I said,’ We’ve had such a terrible loss of life, maybe the smartest thing to do is pull it"- Larry Silverstein

This sounds acceptable except for the fact that A: The onlookers and rescue teams at ground zero were not warned, & B: it takes weeks to rig a controlled demolition, especially a 42 story building. There is no way to rush it, the cordite charges have to be strategically placed so the building falls in on itself. Every demolition expert questioned about this has said that it cannot be done in less than one week, less than 8 hrs is impossible. When was it decided to "pull" WTC 7? Certainly they would have tried to contain the fire first, which would have taken one or two hours minimum; leaving only 6 hours to rig a demolition in a building which supposedly has a raging inferno burning inside it. I am not going to bother asking why the buildings sprinkler system was not working.
For all you thinking that building 7 was imploded by fire or rescue teams in a mad rush to get it all over with, read no further.

For all you who think that you need experts with weeks of preparation and months of booking just to get a building taken down in the first place, then I will tell you that the entire WTC complex was shut down completely for extended on and off durations for the first time in their history (stayed functioning 75% even after 1993 bombing) for "security" and electronic "re-wiring" upgrades shortly before August of that year. Even security personnel who had worked continuously since the WTC began construction in 1969, were given leave of absence. Coincidentally Marvin Bush the U.S. presidents brother was in charge of security at the World Trade Center; www.makethemaccountable.com/burns/030204_BushFamilyCompanyHandledSecurity.htm
Jet fuel consists of kerosene which is refined solely to filter impurities and solid matter, Jet fuel sounds like it burns hot, but the fact is, it needs compressed oxygen(from turbines)to create the raw B.T.U.'s needed to create the massive thrust modern Rolls-Royce jet engines need to propel a jetliner.
The Twin Towers admittedly had thousands of gallons of kerosene burning in them, but engineers claim that kerosene cannot melt steel in a low oxygen environment. In other words in our normal atmosphere.

The fires that were raging for the planet to witness that morning burned with massive amounts of black smoke in an oxygen starved fire. The WTC was purposely designed to not create a "chimney effect" in which any potential fire would perpetuate out of control.
Which brings me to the conclusion that dozens of fire, safety, architectural and structural engineers and leading metallurgists have come to...

The World Trade Center did not collapse from fires.

If you add the fact that designers factored in a theoretical impact with a fully loaded Boeing 707(largest jet at time of construction) into the creation of the WTC without major structural damage to the massive steel support columns or the even more massive steel core columns, you will eventually come to realize that A: the scientists and building engineers are wrong, and that nobody could have predicted that this scenario could take place.
Or B: The official story is wrong.