Comedian Bill Cosby.

Pamela Constable and Arturo Valenzuela. Their new book, "A Nation of Enemies," examines how Chile, , a country with a long history of democracy, slipped into more than a decade of dictatorship under Augusto Pinochet. Constable is Latin America correspondent for the Boston Globe, Valenzuela is director of the Center for Latin American Studies at Georgetown University. (The book's published by W.W. Norton).

Classical music critic Lloyd Schwartz reviews a new recording of music by Czech composers Gideon Klein and Viktor Ullmann. Klein and Ullmann were both imprisoned at the Theresienstadt concentration camp during World War 2, and later put to death at Auschwitz. This is the first of 6 planed recordings of music the pair wrote while under Nazi imprisonment.