Sept. 11, 2001, is not just a memory and a sad remembrance, but a daily question of who we are.

They destroyed the Twin Towers because they hated the dreamers who built them tall and mighty — Minoru Yamasaki, whose vision shaped their grace; Leslie Robertson, whose “tube-frame” design held them aloft.

Civil engineers mapped foundations and slurry walls. Geotechnical experts read the soil and bedrock. Project managers wrangled timelines and budgets. Safety officers enforced compliance. Site foremen and supervisors guided the work.

The ironworkers and steel erectors assembled their skeleton. Concrete workers poured foundations and shafts. Electricians lit their veins. Plumbers and pipefitters ran water and gas. Glaziers hung the aluminum and glass skin. Carpenters shaped frames and forms.

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