Every time I see 911-truther's arguments I realize how bad the American education system is ...
First off, much like how cars are engineered with crashes in mind, when large towers are designed there is a considerable effort put towards managing how the building will fail. Being that you don't want a 100 story building to tip over and spread its destruction over many blocks, most of these buildings are designed to collapse inwards and fall ontop of itself.
Secondly, being that the weight of materials on tall towers is the primary stress on these buildings they're designed with a relatively small margin of error. When you (effectively) have the weight of dozens of floors falling 1 story because the structure beneath it has given way due to a fire damaging the structural integrity of the building, the force is so much greater than what the building can handle that every story will collapse as they experience this force.
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