A South Korean envoy headed to Afghanistan Wednesday, hoping to win the release of 22 South Korean hostages taken by the Taliban last week. One hostage was killed Tuesday. Experts talk about the status of the fighters.

Oil pipelines in Nigeria, the fifth-largest provider of oil to the United States, have been the targets of guerilla groups recently, contributing to last year's gas price surges. Margaret Warner talks with author Sebastian Junger about the latest activity in…