How did building 7 collapse? No planes,just a roof fire. Roof fires dont collapse buildings in to their foot prints. Probably should listen to the multiple recorded testimony of first responders that were in the towers claiming they heard bombs going off before the collapsing.  You really think those flimsy planes could bring down those fortress towers? I would maybe expect a topple from the point of impact. Not the entire building all the way down. Definitely not twice in a row either.