Look above the tower after it begins exploding, beginning around :10. Notice the huge, rising, expanding new cloud. Observe the plume expanding to the right, which is west, which is against the wind. Marvel at the cauliflower shapes, much more distinct than the surrounding smoke that has diffused into the air. There is one and only one explanation for this phenomenon - a very large heat energy input. Standard demolitions do not create a mushroom cloud. This one did.
Besides proving demolition, this video rules out Judy Wood's ridiculous claim of "no significant heat". For anyone who hasn't been paying attention, Judy Wood is a fraud. John Hutchison is a fraud. There is no such thing as any Hutchison Effect. The twin towers were blown up with explosives, most likely nuclear.
Judy Wood is certainly an insider charged with the task of misinterpreting the evidence, and leading people to a false conclusion.