Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
To honor the 50-year anniversary of the first successful ascent of Mount Everest, and the 40-year anniversary of the first American ascent, "National Geographic" produced a 2-hour television event uniting the sons of mountain pioneers Sir Edmund Hillary, Tenzing Norgay Sherpa and Dr. Barry Bishop for a trek to the top of the world. Brent Bishop and mountaineering expert Pete Athans join Diane to talk about 50 years of exploring Everest.
- Brent Bishop Climber
- Pete Athans Mountaineering expert
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