content: WTC 7 was the only steel frame skyscraper ever to have collapsed from fire. Fire was not even seen coming through the windows of the building, which is what happens when serious fires occur in skyscrapers. https://www.google.com/search?q=skyscraper+on+fire&tbm=isch&tbo=u&source=univ&sa=X&ved=0CB0QsARqFQoTCP_DgdinqMgCFQF0PgodbgIMGw&biw=1366&bih=696 And for the record, you are right, jet fuel cannot melt steel beams, or create molten iron, which was found at ground zero.