Researchers opened the chimpanzee genome in 2005, raising a number of fascinating questions. Chief among them: if we share most of our DNA with chimpanzees, what is it that makes us different?
Intelligent. Optimistic. Curious.
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Pattie Boyd was a young model in London when she met and married George Harrison. Eric Clapton courted her while she was still married to Harrison, and both of them wrote songs for her.
Mandaza Kandemwa is widely recognized in Southern Africa as a traditional healer.
Joe Keenan is a novelist. He reads from his latest - "My Lucky Star" - and talks about the story with Steve Paulson.
Many people don't know that the voice of Bart Simpson is really Nancy Cartwright. She started doing voices in her early teens, and credits Daws Butler with teaching her to be an actor with her voice.
Lawrence Krauss isn't only a famous physicist; he's also the subject, along with Richard Dawkins, of the documentary film "The Unbelievers." He tells Steve Paulson that science has replaced philosophy and religion as the place to deal with the Big Questions.
Chandra McCormick and Keith Calhoun have been photographing life in the Louisiana State Penitentiary for 30 years. They talk about the conditions in the prison - nicknamed Angola, for the plantation that was formerly on the site - and how they've changed over time. When they see the inmates working in the fields, they say, it looks a lot like slavery.
Robert Fuller is the author of "Wonder" - the first in-depth look at one of humanity's most important emotions.
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