Tens of millions of Americans take nutritional supplements. New studies allege some pills do not contain what is on the label. Other research indicates consumers may be ingesting too many vitamins. New concerns about dietary supplements.
Diane’s live broadcast from National Geographic continues with Pulitzer Prize-winning historian James MacGregor Burns who published "Leadership", twenty-five years ago; a groundbreaking examination of how leaders shaped the course of history. He has now updated his analysis for the 21st century, and he joins Diane to talk about how his views on leaders and leadership have changed.
- James MacGregor Burns author and historian
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