Reply #22: The period of oscillation and redundancy are related in that both

[petgoat]

are reasons to downplay the significance of structural damage
as a causative factor in the destruction of the towers.

Whom are you expecting to provide reports of major damage
to the core area?

Witnesses who made cell phone calls, people like Brian Clark
who walked down from WTC2 84, cleared away some drywall in
the stairwell, saw no major fires, reported no structural
damage, and stopped at 31 to make phone calls.

A plot like 9/11 could not be done today. Too many people
with cell phone cameras.

you're a millimeter thick.

Said the rock. Try scissors next time.

(edited to add comment about cell phone cameras)