Nine years ago, former FBI agent Robert Levinson disappeared in Iran while on a mission for the CIA. The story of his secret journey to Iran, the CIA cover-up that followed and efforts to rescue the longest-held U.S. hostage.
Doctors and researchers discuss the benefits and risks of vitamin D and why some Americans may not be getting enough of it.
- Joan Lappe professor of nursing and medicine at the Creighton University School of Medicine and investigator with Creighton's Osteoporosis Research Center.
- Joan McGowan Director, Musculoskeletal Diseases Branch and the Bone Diseases Program at the National Institute of Arthritis and Musculoskeletal and Skin Diseases.
- Paul Coates Director, Office of Dietary Supplements, National Institutes of Health
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