[RG911Team] This fact alone proves 9/11 was a false flag. The Twin Towers were designed with the lightest, thinnest steel on the top floors, and each lower section used thicker, heavier and stronger steel than the one above it. This made a progressive collapse IMPOSSIBLE. The idea that a thin, light steel beam would collapse and then crush thick, strong steel below it… and that would in turn crush the even thicker and stronger steel below it… all through the path of GREATEST resistance… all in less than 12 seconds… violates the laws of physics. This is why FDNY sent hundreds of their best firefighters in those buildings. They knew the planes and fires could not completely collapse the towers because the extremely robust design would easily withstand it. 343 firefighters died on 9/11 because they were caught off guard by something no one expected - every single column being ripped apart and blown in every direction. And the only force that can do that requires explosives.