Lecture, in four parts, presented at the Human Behaviour in Fire conference July 2009 by Prof Ed Galea describing results generated from the EPSRC funded project HEED concerning the evacuation of the WTC North Tower on 9/11. The full text of this paper can be found on the FSEG web pages at  fseg.gre.ac.uk/fire/pub.asp, paper 226.

 These series of videos along with a number of other video lectures can be viewed at the FSEG Youtube channel: www.youtube.com/user/FSEGresearch