Terry Gross

The RZA is one of the founding members of the kung-fu-meets-hip-hop group the Wu Tang Clan. He has also written film scores, including 'Kill Bill' and 'Ghost Dog'. Now he has turned his efforts to a new book, 'The Wu Tang Manual'.

In their new book, Lightning Out of Lebanon: Hezbollah Terrorists on American Soil they warn of the presence of Hezbollah militants in the United States. Diaz and Newman say the cells could potentially be more dangerous than al Qaeda.

Edward Berkowitz is a professor of history and public administration and at George Washington University, where he also directs the Program in History and Public Policy. He is an expert on the history of Social Security.