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[–] Laserchalk 0 points 1 point (+1|-0) ago 

Multiple problems with 3 towers that collapsed that day. WTC 1 and 2 couldn't have been crushed all the way to the bottom floor by the top half under gravity alone. Those buildings can hold multiple times their own weight. So even if those floors could have collapsed, it would be impossible for them to completely crush the entire building.

WTC 7 wasn't hit by a plane. The official story is that it apparently feel down to office fires. Steel framed high rises are designed to be completely engulfed in flames and not fall. WTC 7 only had fires on a few floors. The official story involves a sequence of extrememly unlikely events.The most impossible part is that WTC 7 fell at free fall acceleration. You can only achieve this acceleration when there is no resistance.

Dr Hulsey who is a professor of engineering at alaska fairbanks released his report of the collapse of WTC 7 just a few weeks ago. They determined that it is impossible for fires to cause the collapse of WTC 7.