... Why didnt the sites cool quicker? is a good question but the fact that they didnt and that they were so hot for so long (and this just another in the long list of anomalous features that indicate the presence of additional energetic materials), is the critical issue here.
The office contents have more energy, heat energy, than thermite. Jet fuel which started the fires had the heat energy of 300 tons of TNT. Know what, the WTC towers office contents fires had many times more energy. The fires that burned due to office contents had more heat energy than the jet fuel, and the jet fuel beat thermite by 10 times the energy. Plastic in the WTC burning had 14 times the energy of thermite.
Thermite is nonsense, and you don't do physics; proof is your statement.
Did you try to look up energy of different things? Do you do research before spreading delusional statements you googled from 911 truth nuts?
Wood beats thermite and TNT.
Paper beats thermite and TNT.
Plastic beats thermite and TNT.
Jet fuel has ten times the heat energy of thermite and TNT.
http://i286.photobucket.com/albums/ll116/tjkb/JetFuelandWoodBeatThermite.jpg
Using TNT or thermite when you have 66,000 pounds of jet fuel or over 220 floors of office contents to burn, is like bringing a pen knife to a gun fight.
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As such features (molten metal, wtc7's implosion, 100 day fires, pulverized concrete, etc) have never EVER been seen without the use of explosives and in controlled demolitions,, the burden of proof clearly lies with anyone saying these were natural events not involving the use of explosives.
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The truth is in a controlled demolition the primary energy used to destroy the building and turn it to dust and a pile of scrap is E=mgh. It is called physics, and 911 truth expects their loyal Followers not to be skilled in physics.
E=mgh, do you understand physics, or do you need some help? Let me guess, you did not go to engineering school and you failed to do research on 911. There were no explosives used on 911, the energy used to destroy the WTC complex is E=mgh, you might need help from a physics teacher to get your gyros realigned to reality. You have spun off into fantasy-land of 911 truth delusions, repeating the catechism of Gage and other failed 911 truth preachers and snake-oil salespeople.
Good luck; Please go see a few physics teachers and discuss E=mgh, and use some math. Math classes, higher math will help with logic and critical thinking.