Arts

Writer Randall Munroe doesn't love math, but has made a career out of solving equations. By answering outlandish hypotheticals, he uses numbers as a playground for the imagination.

Percussionist Clayton Cameron continues his thoughts about the relationship between math and rhythm and why the number three "feels great."

Dr. Stuart Brown says humor, games, roughhousing and fantasy are more than just fun. He came to this conclusion after conducting some somber research into the stark childhoods of murderers.

Charlie Todd choreographs bizarre, hilarious and unexpected public scenes. He explains how his group, Improv Everywhere, creates these moments of urban whimsy to bring people together.

The off-beat funnyman retires this month after 33 years hosting late-night television. Fresh Air's David Bianculli says that David Letterman's humor "provided a new blueprint for the TV talk show."

American artist currently residing in Rome, Josephine Halvorson paints outdoors.

The Red-Headed Stranger has a new memoir out, titled It's A Long Story. On a tour bus in Thackerville, Okla., Nelson explains to NPR's David Greene why no one can tell him what to do.

The British mystery writer was known for her Inspector Wexford series and in her later years became active in Labour Party politics. NPR's Petra Mayer has this remembrance.

The main character in Aleksandar Hemon's new book is a hapless screenwriter who's never faced real hardship. But after an affair with a Bosnian refugee, he can no longer avoid the realities of war.