Structural engineer Ronald H. Brookman writes in this new retrospective technical article:

“As I discovered through years of painstaking review of hundreds of documents after the final NCSTAR reports were released — indeed, four weeks was not enough — crucial structural information was omitted from NCSTAR 1-9 without explanation, and NIST’s collapse-initiation sequence for WTC 7 was based on speculation. . . .

“NIST’s responses, or lack thereof, to my technical questions should be enlightening to anyone studying the WTC tragedy.”

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