The cover story in the Dec. 2011 issue of Communications of the ACM is "Visual Crowd Surveillance through a Hydrodynamics Lens" (http://dx.doi.org/10.1145/2043174.2043192). This is coauthored by Brian Moore (UCF Math), Saad Ali (SRI), Ramin Mehran (UCF CS), and Mubarak Shah (UCF CS). Ramin Mehran is a Ph.D. student in the Computer Vision Lab run by Dr. Mubarak Shah, Agere chair professor of Computer Science. The article describes how to use inputs from video cameras to monitor "crowds of hundreds or thousands" of people. The goal is to "cue security personnel to individuals or events of interest in crowded scenes."