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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.

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.

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.

Automatic budget cuts have pushed Air Force bases to slash their flying budgets even though it means grounding pilots and reducing readiness. The cancellations are boosting the arguments of those who want the military excepted from sequestration cuts.

The convicted child molester was at the center of a scandal that rocked Penn State University. A recording attributed to him was posted online Monday. The voice repeats what Sandusky has said all along — that he's innocent — and tries to shift blame.

As U.S. officials investigate the attack on the American Consulate in Benghazi, they are trying to determine if al-Qaida urged a Libyan group to launch the assault. If confirmed, this would point to a new al-Qaida tactic.

Gov. Mitt Romney started his campaign calling for big tax breaks for the middle class. Over time his goals for those breaks have expanded to maintaining the government's flow of income and creating jobs. In the end, will a middle-class tax cut still be possible?

The right to choose the school you want your child to attend has been the subject of court battles and bitter political debates. Still, both President Obama and Mitt Romney have made school choice a cornerstone of their efforts to reform public education.

Seaweed farms off the coast of Connecticut may provide financial relief for farmers and environmental benefits for the ocean, not to mention tasty inspiration for chefs. The plant is used in many products from biofuels to cosmetics. But the big question is: Will Americans eat the stuff?