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Looking closely at the footage there was controlled explosions...but a few weeks ago there was a story from the white house that said the magnetic fields changed and weakened because of the heat...and the heat caused by the explosions never reached the temp. to cause the damage or weaken the steel.....even if they did..what about wtc7...
How many other high rise steel buildings have been hit with an airliner? The situation is macabre and rare.
One thing not to forget is the possibility of a construction flaw, since both towers went. Even if the steel itself would not melt, how much did the nuts on the bolts expand when heated? That could make them blow, and take out three and the stability is gone.
But in theory, if they really wanted to make a statement when they flew into the towers, it makes sense if they first prepped the building to really make it come down, since that was the message, bring the western (not just US) financial hub down. They have always been handy with explosives.
I don’t know if they can measure the temperature created in there by certainty, there are a lot of wind at those heights and fuel and fire with streaming oxygen is bound to create a melting point. That is how we learnt to melt iron in the first place.
The magnetic field thing sound weird, but I know too little about it to comment. Sure they can get my compass go crazy and I sail a few degrees in the wrong directions, but stronger than that - WTC a la Stonehenge?