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Did people see explosives being placed all throughout the lower levels of the building? Surely some credible witnesses would have seen something and spoken up by now? ... have any?
Not to say it didn't happen, because there some are some plausible reasons for the government to blowup the building to better conceal what it contained; as a cover to sneak out sensitive materials.
But often the simplest explanation is the correct one ... many people put more faith into modern construction than they should - buildings in recent times are built with the strictest economy leading to minimal structural tolerances compared to older ones...
Back in the old days (prior to the mid 20th century; ie. Empire State Building), due to lack of time to calculate every possible load distribution along with far more reliance on empirical knowledge, buildings tended to be over-engineered (though not always, but often more than not) - among the best examples are many railroad structures, that with minimal maintenance, are still in use, and in excellent shape, 100+ years later.
I don't recall whether #7 was box construction or tube construction ... if it was tube, that alone explains much of the reason it fell. However, if it was box construction, then it would be highly helpful to know the number of columns and their thicknesses, and type, of the steel used, plus the types of connections used, in making a determination whether fire and damage from flying debris alone brought it down or if there was something more involved.
Ron
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