City Life; Jared Diamond on Traditional Societies; Mary Roach

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Today's show is a best-of, so we won't be taking any calls. But the comments page is always open!

Today’s show starts with four views of urban life. Vishaan Chakrabarti of Columbia University talks about the importance of density; we hear about 400 years of history of Greenwich Village; get different views of a regular walk around a block with Barnard’s Alexandra Horowitz; and hear from architect Michael Sorkin on what design says about the city. Plus: Jared Diamond, author of Guns, Germs and Steel, talks about his new book on what we can learn from traditional societies. Then, the twists and turns of our digestive system with writer Mary Roach.