The National Institute of Standards and Technology (NIST) which is the authority to investigate such matters in USA spent three years investigating the collapse and concluded it collapsed due a combination of initial damage due to parts of twin towers crashing into it and subsequent fires and in no way due to explosives as many conspiracy theorists claim.
Here is the final report - fully available online. This is the highest authority available in USA to investigate such issues - there is really no where else to go with this.
It has been thoroughly investigated over 3 years by the highest and most credentialed authority in the land.
But I suppose they are all idiots or in on the conspiracy? And instead Mogga from HotCopper knows best
