>>511106096>shockwaves took down tower 7 a block away while all other buildings were fineNot true:
https://en.wikipedia.org/wiki/Marriott_World_Trade_Center
The Deutsche Bank building was so heavily damaged that it was demolished, and the current Millennium Hilton was so heavily damaged, and demolition was considered.
However, NIST does not ascribe the failure of WTC 7 to damage from WTC 1, estimating that it would have collapsed regardless due to fire.
The truth is the buildings weren't built that well.
The truss + core system makes a building inherently more at risk for collapse in a fire due to differential rates of thermal expansion and the possibility of the truss floors "pancaking."
The buildings also didn't use enough concrete.
The trusses used spray-on fireproofing instead of concrete, and the staircases were encased in gypsum board (drywall), instead of concrete.