Immersing himself in alternate lifestyles and hilarious experiments (usually with himself as the guinea pig), writer A.J. Jacobs tests the limits of behavior, customs, culture -- and reports back on the wisdom and practical knowledge he's gained.
Tea Uglow leads part of Google's Creative Lab specializing in work with cultural organizations, artists, writers and producers on experiments using digital technology at the boundaries of traditional cultural practice.
William A. "Sandy" Darity Jr. is the Samuel DuBois Cook Professor of Public Policy, African and African American Studies and Economics and the director of the Samuel DuBois Cook Center on Social Equity at Duke University.
Bono, the lead singer of U2, uses his celebrity to fight for social justice worldwide: to end hunger, poverty and disease, especially in Africa. His nonprofit ONE raises awareness via media, policy and calls to action.