Comic and actor Paul Provenza (director of "The Aristocrats") and photographer Dan Dion take a searching look at contemporary comedy in their book "Satiristas," featuring conversations with and photos of many of today's leading satirical artists. Paul and Dan discuss the craft of comedy and the issues confronting contemporary comics.

Yale University psychologist Paul Bloom discusses recent research on infant morality. He says babies may not be saints, but they've got a much more developed sense of right and wrong than previously thought. Then, is youth wasted on the young? A large-scale study indicates that people get happier as they age, especially after 50. Psychologist Arthur Stone of Stoney Brook U. describes the findings.

Yale University psychologist Paul Bloom discusses recent research on infant morality. He says babies may not be saints, but they've got a much more developed sense of right and wrong than previously thought. Then, is youth wasted on the young? A large-scale study indicates that people get happier as they age, especially after 50. Psychologist Arthur Stone of Stoney Brook U. describes the findings.

A major new study led by UC Santa Cruz biologist Barry Sinervo has discovered that lizards around the world are dying off, and the culprit appears to be global warming. The finding suggests that an era of climate-driven mass extinctions may already have begun, sooner than scientists anticipated. Barry Sinervo and fellow biologists Donald Miles and Raymond Huey discuss the implications for reptiles and the rest of us.

A major new study led by UC Santa Cruz biologist Barry Sinervo has discovered that lizards around the world are dying off, and the culprit appears to be global warming. The finding suggests that an era of climate-driven mass extinctions may already have begun, sooner than scientists anticipated. Barry Sinervo and fellow biologists Donald Miles and Raymond Huey discuss the implications for reptiles and the rest of us.

For Mother's Day, we rebroadcast a 2009 interview with developmental psychologist Alison Gopnik. She's spent decades studying the minds of infants and young children. Her conclusion: babies are smarter, more aware and more caring than scientists previously realized. Also, inventor Joshua Klein on the surprising intelligence of crows.

For Mother's Day, we rebroadcast a 2009 interview with developmental psychologist Alison Gopnik. She's spent decades studying the minds of infants and young children. Her conclusion: babies are smarter, more aware and more caring than scientists previously realized. Also, inventor Joshua Klein on the surprising intelligence of crows.

Political scientist Brendan Nyhan studies the impact of facts on political views, and finds that often, reality doesn't matter. Journalist Robert Frank reports on the rich for the Wall Street Journal. He says that despite fears that they'd lose their fortunes during the financial crisis, many of the highly affluent are doing better than ever, and the gap between rich and poor has only grown.

Judith Tannenbaum was a teacher working in San Quentin. Spoon Jackson was an inmate serving a life sentence. We'll hear how they met, discovered a mutual love of poetry and forged a 25-year friendship. That friendship is the subject of their memoir, "By Heart."

Theoretical physicist Leonard Susskind on his long-running disagreement with Stephen Hawking about the nature of black holes, with the very foundations of physics at stake.