The latest research into the link between germs and mental illness -- and what we all need to know.
Birds make some of the most beautiful sounds in nature. But scientists don’t really know why birds sing. Diane and author/musician David Rothenberg talk about the mystery of bird song. We’ll also hear about the reappearance of the ivory-billed woodpecker.
- Tim Gallagher editor in chief of "Living Bird," is an award-winning author and wildlife photographer.
- David Rothenberg philosopher, musician, and author of "Why Birds Sing,""Sudden Music," "Hands End," and "Always the Mountains."
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