-=> Quoting Mike Ross to Charles Angelich <=-

 > BTW the buildings falling straight down is a known failure
 > mechanism called pan-cake or accordion mode. The weight of
 > the upper floor falling on the one below it causes it to fail
 > instantly and the whole thing cascades floor after floor all
 > the way to the ground.

 Even 3- and 4-story buildings are designed that way today. That
 is the theme of a few engineering stories before and after WTC,
 written mainly for first responders to emergency situations.

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