Some of the finest thinkers in history were also enthusiastic walkers. Philosopher Frédéric Gros tells Carole Cadwalladr why we should fall in step with Nietzsche and Kant
John Steinbeck's classic is revived on Broadway with an all-star cast, but the critics can't agree if its leads bring huge chemistry or are simply reading from CliffsNotes
Sean O'Hagan: Using a cheap Holga film camera, Zhang Xiao captures the otherworldliness of a new-year festival that has survived China's surge towards modernity in Shanxi, a haunting new photobook
Flash Boys, an exposé of 'rigged' high-frequency trading, has sold 130,000 copies in its first week and is already being turned into a film. Its author, Michael Lewis, tells Emma Brockes why the story is so compelling
Pushpinder Khaneka: our literary tour of Somalia examines lives blighted by civil war, and unearths reasons for optimism in the 'world's most failed state'