I am new to this forum so forgive me if this question has been asked before. My brother is a firefighter and visited NY city right after 9-11. There was evidence of thermite or thermate melted steel. Why haven't we heard anymore about the bombs that brought the twin towers down as well as building 7 that was not hit by an airplane? If you look at footage of the Oklahoma City bombing, the building didn't fall down, just partly blown apart. The twin towers fell like a planned demolition. Looking for answers.