Hi,
The fires of WTC-7 are not of "unknown origin". There was the
matter of 50,000 gallons of diesel fuel stored in the basement
not far from the power substation large enough to run a small
city.
Yes. but these tanks were below ground level and even so, if every
drop had burned, the building should have survived.
The FEMA official analysis is still "unknown origin."
Here are the very important case-studies of 5 similar fires in
high-rises, which had more fuel (also from diesel substations),
burned longer, and did NOT fall. Go about 4/5 down this page:
http://thewebfairy.com/killtown/wtc7/fire.html
J.
After the main course, go here for your appetizer:
http://thewebfairy.com/killtown/wtc7/pullit.html