See the full episode at http://video.pbs.org/video/2119539367NOVA's Engineering Ground Zero premiered Wednesday, September 7, 2011 on PBS at 9PM ET/PT (check local stations). http://www.pbs.org/nova/wtc
Questions about NOVA | Engineering Ground Zero | PBS
Want more info about NOVA | Engineering Ground Zero | PBS?
Get free advice from education experts and Noodle community members.