Terry Gross

Dr. Lori Arviso Alvord is the first Navajo woman surgeon. She is the author of the new book "The Scalpel and the Silver Bear." (Bantam) In her practice, she combines modern surgery with ancient Navajo healing practices. Born and raised on a reservation near Gallup, New Mexico she now serves as an assistant professor of surgery at Dartmouth Medical School in Hanover, New Hampshire.

Kevin Bales is a leading expert on the modern-day practice of slavery. He is author of the new book "Disposable People: New Slavery in the Global Economy." (University of California Press) Bales is a principal lecturer at the Roehampton Institute, University of Surrey, England.

Craig Stanford studies chimpanzees and gorillas in Uganda. In early March, Hutu rebels kidnapped 14 westerners including his field assistant. 8 of the hostages were killed. Stanford had left the region before the attack. Stanford talks about the political situation and its impact on the wildlife there. He is an associate professor of anthropology at the University of Southern California. He is the author of "The Hunting Apes," and "Chimpanzee and Red Colobus."