Terry Gross

Peacock has devoted the last 20 years to saving the grizzly bear. Like many veterans, he had trouble adjusting when he returned from Vietnam. He sought a life of seclusion in the mountains and it was then that he first encountered grizzly bears. Now, he performs research alone through the mountains of Wyoming and Montana studying the behavior, social hierarchy, and communication methods of grizzlies in their natural habitat. In addition to his several books, he recently contributed to "Mark of the Bear: Legend and Lore of An American Icon."

Film critic Lisa Schwarzbaum reviews Hong Kong marshall arts master Jackie Chan's new film, "Supercop."

McKenna has just written "Manhattan North Homicide: The True Story of One of New York's Best Homicide Cops." In his 30 years with the NYPD, he's worked on some of the cities most infamous cases and he describes them in the book: The Central Park Jogger Case, The Preppie Murder Case, The Brooklyn Bridge Shootings, and The Baby Maldonado Case. McKenna worked his way up as a uniformed patrolman to detective first grade to Manhattan North homicide--an elite force within the NYPD.