Wiseman, don't you also wonder why the 9/11 Commission Report doesn't mention anything about explosions in their report (other than when the planes hit), and didn't choose to investigate for them because they claimed that there was no sign of explosives used? NIST didn't bother examining the steel for explosive residue.
After the first tower collapsed and right before the second one did (note also that the explosion/s come from the building that was hit an hour and 41 minutes before):
16 seconds long:
10 minutes, 22 seconds long:
Almost an hour long:
All I know is that I cant see why the videos of the plane hitting the pentagon has still not been released to the public, and secondly why the culprits(alledged or supposed) still havent been caught.