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Our closest relatives, chimpanzees and gorillas, breast-feed their offspring for several years. Some baby orangutans nurse until they are 7 years old. Researchers found a way to test ancient teeth for clues about when humans cut nursing short.

The Islamic group Hamas runs the Gaza Strip and controls the police force. A number of young men say police plucked them from the street and shaved their heads recently, apparently because the officers didn't approve of their hairstyles.

Guest host Celeste Headlee and editor Ammad Omar crack open the listener inbox for feedback. This week, violin lovers say a conversation about aggressive parenting hit the wrong notes.

President Obama is in Costa Rica to discuss regional cooperation and security with regional leaders. This follows talks he had in Mexico with President Enrique Pena Nieto. During his two-day visit, Obama tried to steer the focus away from contentious issues like immigration and drug violence.

President Obama lost Texas by more than 1 million votes last year. But Democrats believe their fortunes in the state may soon be changing, thanks to demographics and a new organizational push.

As Colorado lawmakers debate rules regulating recreational marijuana use, one big question looms: how to charge taxes that will fund oversight of retail pot businesses. The tax requires a statewide vote. If it fails, some worry that underfunded enforcement will invite the feds to shut recreational pot down entirely.

Audie Cornish talks to Robert Smith about the latest on the elementary school shooting in Newtown, Conn.

In the category of unintended consequences, Susan Rice's announcement about her future plans could mean a Republican in President Obama's inner circle, decorated Vietnam veterans overseeing the nation's military and foreign policy, and another special election for Senate in Massachusetts.

Christians the world over are celebrating Christmas. India, the birthplace of Hinduism, Buddhism and Sikhism, marks the birth of Jesus with a national holiday. In this land of great religions, Christians and non-Christians join in the festivities of this season with song and special meals.

In Newtown, Conn., Christmas is very different this year, a little more than a week after the shooting at an elementary school. Eight families that attend St. Rose of Lima Catholic Church lost children to the tragedy. Parishioners came to Christmas masses there seeking solace, and priests gave a message of hope and comfort.