Originally posted by realityhack
When the outer supports are removed by a jet knocking them side ways (a direction they have little strength) then the central column is left supporting more than it is designed to.
When more of the external structures give way the central column is no longer man enough and buckles and each floor drops onto the one below.
The central column provides ties to start the direction of fall towards the middle of the building at basement level. Momentum keeps them goning that way.
The entirety of both buildings did not land in their own footprint. They did fall sideways. The conspiracy theories just say they did.
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