I've found this to be interesting:
http://www.tms.org/pubs/journals/jom...agar-0112.html
I did see an interview with the chief architect? of the WTC after 9-11, he said almost wailing 'we never expected anyone to fly jumbo jets into it!' He was clearly blaming himself.
Pete
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“How many legs does a dog have if you call the tail a leg? Four. Calling a tail a leg doesn't make it a leg.”
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