Four years later, there are a host of unanswered questions about the events of 9/11, including the unexplained and unprecedented architectural collapses of three office towers, and the extent of toxicity in the air of Lower Manhattan.
"Why Did WTC 7 Fall? [WTC 7]was...probably the first steel skyscraper anywhere to collapse solely because of fire. We still don't know why...according to FEMA's report on the collapse [the fire hypothesis] "has only a low probability of occurrence."
"How did the twin towers fall? Many FDNY personnel who saw the south tower collapse reported explosions at the lower levels as the top began collapsing. These reports, as well as "squibs" of smoke seen on video of the collapses, have led to theories that the towers were brought down in controlled explosions."
"Conspiracy theorists aren't the only ones who dispute [the official]version: Some fire scientists also take issue with [it]...And the point isn't just historical. The lessons learned from the WTC collapse will inform decisions about the safety of other modern office towers."
FULL STORY: Open and Shut
Seattle Legalizes Co-Living
A new state law requires all Washington cities to allow co-living facilities in areas zoned for multifamily housing.
Central Florida’s SunRail Plans Major Expansion
The expanded train line will connect more destinations to the international airport and other important destinations.
NYC Officials Announce Broadway Pedestrianization Project
Two blocks of the marquee street will become mostly car-free public spaces.
Electric Car Share Comes to Detroit’s Eastside
The program is operated by the Eastside Community Network and funded through the U.S. Department of Energy.
Limited Transit Access Stifling Memphis Economy
The city ranks low for transit access to jobs, limiting opportunities for local workers and businesses.
NYC Likely to Legalize ADUs as Part of ‘City of Yes’ Reforms
Homeowners in some neighborhoods could soon be able to build accessory dwelling units in their backyards, garages, or basements.
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This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
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