The original topic years ago, if I remember correctly, pertained to the movement of gun barrels due to heat. And whether or not the freezing of barrels to put them back to the original position was a solution. So, that is why I brought it up when I saw the article this weekend. Some, on this board said that the heat alone from the aircraft fires was enough to drop the buildings while others thought not. So, if the heating of metal and the bending of it is offensive, I apologize. But, I thought it was something to report to some of the older members who remembered the discussion. Have a nice day.