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NOVA - Ground Zero Supertower

Ground Zero Supertower Ground Zero Supertower
Engineers race to complete 1 World Trade Center as they grapple with the final challenges.
http://video.pbs.org/widget/partnerplayer/2365076006/?player=WGBY-PBS&w=512&h=288&chapterbar=true&autoplay=false Engineers race to complete 1 World Trade Center as they grapple with the final challenges. /episodes/get/10251 /episode/10251 NOVA: Ground Zero Supertower /episode-player/10251
10251