If I may join the conversation, just an observation: 99 times out of 100, the simplest answer is the true answer. The most basic evidence is also the most telling. With that in mind, it's my opinion that we don't need much to know what happened in the towers if we watched CNN all morning, which I think everyone on the planet did.

I apologize for bringing this up but here goes: people were jumping out the windows. Men and women in suits and dresses were jumping out the windows from the highest floors to certain unmistakable death onto rooftops and sidewalks below.

If you watch the very painful French documentary 9-11, made by two brothers who just so happened to be making a documentary on New York firefighters the morning of 9/11, there is an agonizing scene in the lobby of Tower #1 in which there are successive, violent, anguishing slams to the lobby ceiling as office workers landed upon it.

So: why? Why would people just above and below the floors into which the planes crashed jump to their deaths?

Passenger jet fuel at temperatures unimaginable made it impossible to breathe the air, to touch the walls, to stand on the floor. No stairway to escape to, no doors to open, pure burning heat that burned the skin just to be there.

First the chairs and desks broke the windows, then people chose to jump. CNN showed many before they opted to quit showing it. Then they started showing the faces of those on the ground watching people jump. Have we forgotten the elderly black woman looking up at the tower, screaming "Don't jump!"??

I'm sorry but what else do we need? Does anyone need a scientist to explain how much jet fuel is necessary to create that kind of heat? They couldn't stand on the floor. Take your best guess.