Agents without evidence of steel core columns must do something to obsufucate. Your behavior is predictable.
The Twin Towers had a concrete, rectangular tubular core. That is the only core that can be proven with evidence that has independent verification.
Robertson is verified by
Oxford, verifying
Domel who describes a concrete core verified by the image of
WTC 2 core, verifying the
top of WTC 2 core falling onto WTC 3, the
WTC 1 rebar, just after the
WTC 1 west core wall is seen in an end view, then, the
WTC 1 east shear wall toppling, consistent with
interior box columns silhouetted on WTC 1 north core wall, consistent with ground zero showing the
WTC 1 north concrete core base wall, 12 foot thick, all supported as clarification of the many confused statements that do mention concrete in the core including the latest revised NIST contracted analysis of free fall by
Bazant et. al 6/21/2007, which actually provides an equivalent amount of high explosives needed to create the rate of fall they are attempting to justify with physics. It doesn't work, but at least they won't go down in history as totally supporting the deceptions.