[thegathering]

I guess the biggest problem with his theory is that explosives have to be set before they can be detonated.

There is no evidence that those parts of the tower were deconstructed to have explosive charges layed inside the steel support columns before the towers were hit. A detonation of that scale would take months of careful planning to be executed... and almost as long to prepare the building for detonation, coordinate drilling locations, and set charges.

Explosives could have been a possibility, but research was not conducted on the possibility of explosives in the tower because there was no evidence to support explosives being in the tower (unlike an aircraft and jet fuel).