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.
We pay a visit to Reedsburg, Wisconsin's annual Fermentation Fest, a celebration of all things cultured and fermented.
Are humans hard-wired to forgive? Psychologist Michael McCullough's research traces the evolutionary roots of forgiveness and revenge.
Producer Sara Nics on the story behind this show... how she's tried to come to terms with our narrative selves.
Author of "Waiting for Snow in Havana" started to worry about death as a child, growing up in Cuba during an era of public executions ...
Contemplating the multiverse is mind-blowing, but if you want a truly earth-shattering controversy in physics, you have to go back 500 years to Copernicus' radical theory. Dava Sobel tells his story.
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.
Canadian philosopher Charles Taylor says we're now living in "a secular age," but we're still trying to figure out what a post-religious world looks like, and how we can find meaning in a culture without any over-arching purpose.
