Angled cut column explained.
The photo with the angled cut column has somehow taken on an almost mythical status amongst some people in the 9/11 movement. In this short video I explain that it's not evidence of thermite and how it could very well have been done by cleanup crews with a thermic lance.
So, let's look at some real evidence of explosives on the core columns. Gordon Ross' theory, in which concussion charges are placed against the welds of the thickest core columns, explains exactly what we see in the pile; column ends that are bent, broken and exploded. You can watch his presentation on YouTube (part 1, part 2, part 3).