There is something that has always bothered me about the 9/11 attacks

[kandrathe]

I watched the second plane hit the tower in real time. I watched the live broadcast of the towers collapsing. I watched many of the replays over the following few days. I saw no indications of secondary explosions.

Ditto. I was getting ready for work watching the news when the first plane hit, and they broke the story. They were reporting a plane crash into one of the towers, and possibly thinking it was an accident. I remember when the 2nd plane hit the other tower saying out loud, "Ok, that was not an accident." So, I played hooky from heading into the office and watched the news until the towers collapsed. Then, after my tears had dried up, I went into the office for the last half of the day.

I believe that the official story is true.

I agree. When the 1st tower began to fall, you can witness the pancaking beginning just under the impact point, which is consistent with the theory that the burning jet fuel weakened the girders leading to the collapse. Total collapse was inevitable once enough weight was in motion downward. I've read the post mortem analysis by the building engineers who understand how the building was constructed, and how it came apart. I did hear that there may have been some negligence due to limited amount of fire proofing given to the main structural girders. But, I have doubts that it would have saved the building given the amount of jet fuel burning in that enclosed space. Nuclear containment domes are designed to take an impact from a 747, not modern skyscrapers.

South Tower collapse slow motion
North Tower collapse (at the 2:54 min mark)

EDIT: One other point... When things this big begin to fail, I wouldn't doubt that there were large "explosion" like sounds as girders began to buckle under the unbalanced stresses. Even minutes before the actual collapse.