I was prompted to write concerning the article in on the design of high-rise building following the events of 9/11 (4 November).
I have carried out my own extensive research of the collapse of World Trade Centre. My own conclusion is that they were brought down by planted explosives. The bible on the events of 9/11 is, in my opinion, The New Pearl Harbour by David Ray Griffin (second edition).
Look at the facts and you be the judge. Prior to 9/11, no high-rise steel frame had ever collapsed!