Very interesting site, that 11-settembre.blogspot. It has a very credible explanation for “pools of molten steel”:
http://11-settembre.blogspot.com/2007/12/molten-metal-pools-may-have-simple.html
It also has several photos of the steel debris salvaged from the site. Columns bent completely back upon themselves, clear evidence of structural failure.
https://11-settembre.blogspot.com/2007/02/whistleblower-wtc-blueprints.html