Reply #16: If the zipper theory is correct, a plane crash could initiate [View All]

[petgoat]

the unzipping and the collapse just as well as explosives could. But
NIST (the latest official theory) doesn't subscribe to the zipper
theory. NIST insists that the truss "clips" were so strong that sagging
floors buckled the perimeter columns.

Whether MIT will bother to defend their theory in the face of official
opposition will be interesting to see.

Why do pro demolishers use so many charges? Conventionally-framed
buildings are arrays of columns and beams; if they are not brought down
all at the same time, chaotic collapse could result. This is one reason
the absolutely symmetrical center-first collapse of WTC7 is so
unbelievable. How could random fires or random structural damage result
in a textbook controlled collapse?