How many first hand accounts do you have to dismiss before you say ok, bombs went off.  Fireman and employees over and over and over all say the same thing.  Explosions, one after the other.  The conspiracies have better science to back them then the given explanations.   Please do some research, most who do realize that the story is swiss cheese at best on over a hundred different areas.  Look up the put options on United Airlines the weeks prior to 9/11.  Irrefutable.