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NBC's a cappella competition "The Sing-Off" returns for a fourth season on Monday, Dec. 9. The executive producer and judge Ben Folds discuss what's to come.

David Greene talks with Sylvain Groulx, head of mission for Doctors without Borders in the Central African Republic, about the state of the violence there and the hopes for peace now that French troops have arrived.

Serving chicken, pigeon or duck for the holiday may be harder this year for some families in China and Hong Kong. As the deadly H7N9 virus continues to spread, officials in China have closed many live poultry markets, while agricultural workers in Hong Kong plan to cull thousands of chickens this week.

Out of Cairo on Monday came new indications that Egypt's military chief, General Abdel Fattah al-Sisi, will run for president in an election expected within the next three months. The Supreme Council of the Armed Forces, Egypt's highest military body, disseminated a message praising Sisi and endorsing him for a presidential bid.

The Obama administration is considering targeting an American citizen who is suspected of plotting a terrorist attack. The possibility again raises questions about U.S. drone policy and whether an American's citizenship rights are lost once that person joins a terrorist organization.

President Obama is meeting with heads of state from Canada and Mexico. These North American neighbors are often called the "three amigos." They are expected to talk about trade and border security.

Scientists are studying the way we show complex emotions. It turns out we're better at it than was previously thought, mixing and matching basic expressions with sophistication — and consistency.

In Chile, a fire that started in the hills above Valparaiso continues to burn. The blaze has killed 15 people and destroyed 2,500 homes in the area that surrounds Valparaiso. Reporter Alexandra Hall looks at some of those affected.

Military suicides went up again in 2012, as defense officials and Congress grappled with what to do. Of the 349 suicides, there were 182 in the active-duty Army, compared to 165 in 2011.

The trio of scandals that have engulfed the White House may not be big news by 2014, but now is the time when prospective candidates must decide if they want to be on the ballot. Is the news of the moment hurting the effort?