Terry Gross

Sonia Ancoli-Israel specializes in sleep disorders, including sleep apnea, insomnia and sleep disturbances in the elderly. She is the author of "All I Want is a Good Night's Sleep." (Mosby-Year Book) She directs the Sleep Disorders Clinic at the Veterans Affairs Division of the San Diego Health Care System.

William Langeweische is a writer and a pilot. He grew up around planes and learned to fly when he was a child. His father, a test pilot, wrote a text that is considered to be the bible of aerial navigation ("Stick and Rudder"). Langewiesche has written his own book about flying from a different perspective, called "Inside the Sky: A Meditation on Flight."

Jury consultant Jo-Ellan Dimitrius. She's consulted in over 600 trials, including O-J Simpson's and Rodney King's. Dimitrius' company, Forensic Technologies International, uses techniques like random phone surveys to learn about public attitudes. In jury questionnaires and interviews, Dimitrius says he can get potential jurors to reveal their pre-dispostions. In her new book, "Reading People: How to Understand People and Predict Their Behavior," (Random House) she discloses some of the tricks of her trade.