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For centuries, explorers tried to find la Ciudad Blanca, a fabled city in the rain forests of Central America. Dense jungle impeded efforts to uncover it. Douglas Preston tells the story of a team who used light detection technology to survey the iconic ruins from the air.

A critical, unsupportive spouse isn't just a drag. That kind of mate increases the risk of major depression, researchers say. People can improve the quality of their relationships, Teo says. Interpersonal therapy and couples therapy can help identify communication problems and come up with practical improvements.

The use of chemical weapons has been taboo since World War I, when poison gas inflicted a million casualties. Despite the destruction of large stockpiles, controlling or destroying remaining weapons remains tricky.

Former South Carolina Gov. Mark Sanford will face Elizabeth Colbert Busch in a special election for South Carolina's first district congressional seat May 7. NPR's Ken Rudin, NPR's Kathy Lohr and Robert Oldendick, University of South Carolina, discuss the candidates, the debate and the district.

Almost half of all undocumented immigrants living in the U.S. came legally — but then overstayed their visas. In an effort to curb those "overstays," the Senate is considering a bill that mandates tracking visitors' visas when they leave the country, not just when they arrive.

When it comes to the U.S. role in Syria's civil war, President Obama says he's weighing all options. Whatever he decides, he'll have to make his case to a public that hasn't been paying close attention.

Fewer than three weeks after they were severely injured in the Boston Marathon bombings, Celeste Corcoran and her 18-year-old daughter, Sydney, are entering a new phase of recovery and rehabilitation. Part of their healing is emotional, not physical.

On Thursday, the City Council will debate proposals including raising the minimum age for buying cigarettes to 21. Also on the table is a ban on tobacco displays behind retail registers. Critics are pushing back, arguing that the changes won't have the intended effect.

A young woman in Nigeria says God spoke to her in her dreams, guiding her to become a car mechanic. Despite initial resistance from her family, she fulfilled her vocation and has gone on to train other young women to do what one trainee calls "the best job in the world."

The company showed a profit of nearly $220 million for the quarter but it fell short of analysts' expectations. CEO Mark Zuckerberg blamed the missed target on higher costs. Company spending is up 60 percent this quarter over the previous one due to hiring and new developments.