From Physorg Forum
Leslie E. Robertson Unregistered
Posted: Apr 1 2006, 06:33 PM

Christophera is correct in stating that the Twin Towers were constructed
with a concrete core. Although in my original design the core was to be a
steel framed one that decision was overridden by Minoru Yamasaki the
architect.

That core should have resisted the airplane impacts AND the fires.
I have said nothing for four and a half years but can remain...