If we think of cities as organisms, their DNA is the hodgepodge of rules that shape development. Urban planner Emily Talen talks about how city zoning, coding and laws got started, and how they need to be changed to help us build more livable cities.
Take a look at a visual archive of city plans.
Reporter Charles Monroe-Kane visits one of the last surviving grist mills in the US. He learns how water power is used to grind wheat into flour, and learns something about himself as well.
Novelist Stephan Eirik Clark's Dangerous Idea? Subdivide the United States into smaller countries.
Don't look for authenticity on your plate! That's the message of Barry Glassner's book, "The Gospel of Food."
Daniel Levitin runs McGill University's Laboratory for Musical Perception, Cognition and Expertise.
Historian Jill Lepore talks about her restless search for the long-lost manuscript, "The Oral History of Our Time." It ran some nine million words and was supposedly the work of a madman named Joe Gould, who believed he was the 20th century's most brilliant historian.
Historian Erik Durschmied tells Steve Paulson about some of the significant battles throughout history that turned on a change in the weather.
Bill McKibben has been warning us about global warming since his 1989 book "The End of Nature." In his new Book, "Deep Economy," he makes the case that "more" does not lead to a happier life.
