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From the Libya brain freeze to the "smoking ad," we look back at some of the Cain campaign's most excruciating moments.

The Republican businessman said "false accusations" about an alleged affair and claims of sexual harassment had taken too much of a toll on his family. He vowed to keep pressing the issues that fueled his campaign.

December marks the beginning of the end of the U.S. war in Iraq. The withdrawal has already begun as hundreds of U.S. troops leave Iraq every day. NPR is taking a look at the eight years of the war: the turning points, the costs and expectations about what comes next.

Representatives from 191 countries are meeting in South Africa this week to discuss the future of the Kyoto Protocol and whether to start work on a new binding treaty. Also attending is NPR's Richard Harris. We asked him to answer some questions about the U.N. climate change talks.

Researchers need your help to unlock the secrets of whale songs. A new online experiment is recruiting citizen scientists to study killer and pilot whale calls from around the world.

Herman Cain is a presidential candidate no more. Cain's campaign was always unconventional, and just as he made his unlikely rise to front-runner status, he was enveloped in controversy about alleged inappropriate behavior with women. His campaign never recovered. NPR's Tamara Keith looks back at his campaign.

The U.S. relationship with Pakistan is in crisis, a week after an incident in which NATO troops killed 24 Pakistani soldiers along the Afghan border. The Pakistanis have cut off a key NATO supply line to Afghanistan, and they've refused to take part in the Bonn Conference on Afghanistan. NPR's Corey Flintoff reports from Lahore, Pakistan.

More than 32 tons of marijuana were found last week in an underground tunnel along the U.S.-Mexico border. It was one of the largest pot busts in U.S. history. Host Audie Cornish talks with Derek Benner, a U.S. Immigration and Customs Enforcement special agent, about the tunnel they found and the seasonal aspects of the drug trade.

Iran's armed forces have shot down an unmanned U.S. spy plane that violated Iranian airspace along the country's eastern border, the official IRNA news agency reported Sunday. But a U.S. defense official said there was no indication it was brought down by hostile fire.

In Eric Weiner's newest book, Man Seeks God, the former NPR foreign correspondent heads around the world on a humorous and thoughtful quest for spirituality.