Sorry to come in here uninvited and rain on some people's parade.
The collapse of WTC7 has been explained to the satisfaction of not only the insurance companies, engineers and journalists worldwide, as well as
serious researchers of 9/11.
This is one of a number of sites that provide details.
www.debunking911.com...
I recommend reading through other article on the site.
While some specifics are still being ironed out and initial presumptions and errors corrected, there is nothing mysterious that took place outside of
damage to the building eventually causing it to collapse.
No one in the world can claim to be an expert on what exactly happens when you have two fuel-filled airplanes fly into such a clluster of structures
at high speed acting essentially like gigantic bombs. But there are engineers and physicists, as well as demolition experts who have examined all
evidence and accounts and put a satisfactory explanation together.
Those who feel compelled to deny what happened, that these buidings all fell due to the unusual and exceptional damage they experienced, will spend
the rest of their lives picking away at videos, accounts, official documents looking for something devious on the part of the US government.
This only assists the perpretrators of this heinous act as disinformation is spread around to the point that any bonafide factual data just gets lost
in a flood of unfounded and baseless speculation and lies.
Mike F