9/11 - What has officially been debunked?

Originally posted by HowardRoark
They are less prone to progressive collapse. They topple because of foundation issues related to the earthquake.

And you know all about "progressive collapses" just from WTC1, 2, and 7 collapses? Those are the only "progressive collapses" skyscrapers have ever suffered, and engineers are still scratching their heads trying to figure out how they fell because they absolutely will not consider demolition.

NIST can't come up with explanations for WTC1 and 2's collapses beyond their initiations, and is calling for outside help with WTC7. And yet you know all about progressive collapses and earthquakes nonetheless? And you're not even an engineer? Impressive!

The term "progressive collapse" is synonymous with demolition for me.