As Kenya remains embroiled in violent disputes over President Mwai Kibaki's re-election, there have been frequent references to tribal allegiances playing a role in the unrest. Guests discuss what a "tribe" is and why some people take issue with using the word in the 21st century.
Caroline Elkins, author of Imperial Reckoning: The Untold Story of Britain's Gulag in Kenya; associate professor of African studies at Harvard University
Ali A. Mazrui, chancellor of Jomo Kenyatta University of Agriculture and Technology in Nairobi; director of Global Cultural Studies at the State University of New York at Binghamton
Ngugi wa Thiong'o, author of Wizard of the Crow; professor of English and comparative literature and director of the International Center for Writing and Translation at the University of California, Irvine