Copernicus changed the world with his revolutionary idea that the sun, not the Earth, is the center of our solar system. Dava Sobel tells us why this momentous discovery wasn't easy for Copernicus himself.
Intelligent. Optimistic. Curious.
Audio
Psychologist Steven Pinker's Dangerous Idea? We may be living in the most peaceful time of our species’ existence.
Chris Kilham tells Jim Fleming that it’s OK to eat chocolate and has the data to prove it.
Edmund Morris has written three books about Teddy Roosevelt; his third, "Colonel Roosevelt" picks up the story after TR left the White House.
David Grinspoon is the author of “Lonely Planets: The Natural Philosophy of Alien Life.”
Fred Burton says we're right to fear the insidious threat of terrorism. Burton was one of the first three agents to serve in the U.S. government's elite Counter-Terrorism Division and is the author of "Ghost: Confessions of a Counter-terrorism Agent."
David Syring is descended from the German immigrants who settled the Texas Hill Country. He tells Jim Fleming about his problematical grandfather, and why he still feels rooted to his family's home place.
"I was very uncomfortable with death for most of my life," says Karen Reppen says she ran from death and dying for most of her life. But after she decided to face her fears head-on by getting a job in hospice, she started to see the moment of death as a source of wonder and joy.
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