<em>Patt Morrison</em> is known for its innovative discussions of local politics and culture, as well as its presentation of the effects of national and world news on Southern California.
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Crowd Statistics

Can a million man march only have 400,000 people? How many people are really involved in crowds of "tens of thousands" that have been reported in recent immigration marches? Accurately estimating the size of crowds is not only a daunting task, but has important implications for crowd safety, law enforcement, and event organizers. Professor Mike Alvarez of Caltech talks to Patt about how estimates are made, and how these numbers can be powerful tools for activists and officials.