And we should thank those 19 Muslim daredevils and Bin Laden for suspending the laws of physics and bringing down WTC 1 & 2 so neatly straight down in a pile and for turning much of the mass into dust so that there wasn't as much debris to pick up.
Had the 110-story Twin Towers fallen over sideways, they would have caused massive destruction in lower Manhattan, destroying dozens of other buildings and killing tens of thousands of people.
Those guys had it out for Larry Silverstein. They destroyed all of his properties on the morning of 9/11 except one, building 7, but finally got it to collapse around 5:20 that afternoon.
But just as luck would have it, all it really took was a few fires, no plane needed, and building 7 just fell into its footprint and at near free fall speed. I can hear Bin Laden as he watched the event on his big screen TV in his cave saying; "Whew ... about time."
I like this new video (below) from BuildingWhat. They've taken out the sound so there's no distraction from the visuals and you can focus on the collapse.