World leaders react to a historic shift in U.S. policy toward Cuba. Pakistan buries victims of a school massacre by the Taliban. And U.S. officials say North Korea is behind the hacking of Sony Pictures. A panel of journalists joins Diane for analysis of the week's top international news stories.
Deep in the heart of an uncharted rainforest in Northern California lives the tallest tree on the planet. Author Richard Preston tells the story of the majestic Sequoia sempervirens and the daring group of botanists and amateur naturalist who scaled the tallest trees and discovered a new ecosystem.
- Richard Preston a writer for "The New Yorker," and author of "The Hot Zone," "The Demon in the Freezer," and the novel "The Cobra Event."
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A panel of journalists joins Diane for analysis of the week's top national news stories.
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
Cuba releases American contractor Alan Gross after five years' imprisonment on espionage charges. The U.S. releases several Cubans in exchange. Details on the prisoner swap and the future of U.S.-Cuban relations.