'Critical Mass': The Bike Ride That Changed the City

Some 200 hundred cyclists, members of the advocacy group "Critical Mass" begin a ride from Union Square on Sept. 24, 2004 in New York.

Evan Friss, associate professor of history at James Madison University and author of the book, On Bicycles: A 200-Year History of Cycling in New York City, joins us to discuss the history of Critical Mass

This segment is guest-hosted by Shumita Basu