For decades, urbanists have been thinking about cities as organisms. They take in resources, eject waste, spread and grow. Theoretical physicist Geoffrey West decided to put the idea through the mathematical ringer. So, are cities like organisms? Yes. And no.
You can also hear the uncut interview with West.
Are humans hard-wired to forgive? Psychologist Michael McCullough's research traces the evolutionary roots of forgiveness and revenge.
David John is a chess Life Master. He went to college on a chess scholarship, but now makes his living as a professional poker player in Las Vegas.
Historian Donald Sassoon tells Jim Fleming that the Mona Lisa is a great painting, but that other factors conspired to make it an international icon.
Brian Turtle tells Steve Paulson how he came up with the game "Six Degrees of Kevin Bacon" and plays a few rounds with Steve.
Carlos Ruiz Zafon tells Jim Fleming that his recent books are part of a sort of Chinese box set of four inter-related novels involving the same characters and his native city of Barcelona.
Daniel Levitin runs McGill University's Laboratory for Musical Perception, Cognition and Expertise.
