Bioengineers are creating human body parts to replace organs and manage life-threatening diseases. How techniques like 3-D printing and stem cell research are driving medical advances and raising ethical questions
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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