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Scientists have frozen their ship to an ice floe to study the causes and consequences of diminishing Arctic ice, in the hopes of improving how the Arctic is represented in climate models.

After weeks of closed-door depositions, Democrats are planning open hearings this week about the Ukraine affair. Here's where the story stands — and what's coming next.

Christopher Anderson, onetime aide to the former special envoy to Ukraine, will be interviewed along with Catherine Croft, who served as special adviser for Ukraine in the State Department.

Compared to the rest of the world, American schools don't stack up like they used to. But what's the best way to educate children? Author Amanda Ripley followed students and teachers across the globe to find out for her new book, The Smartest Kids in the World: And How They Got That Way.

To preview President Obama's $3.99 trillion budget, David Greene talks to Shaun Donovan, Director of the Office of Management and Budget.

Five weeks after hundreds of Nigerian school girls were abducted by the extremist group Boko Haram, bomb blasts have hit two cities. Journalist Chika Oduah gives an update on the volatile situation.

A high-end jewelry company recycles the components of assault rifles into watches, rings and other luxe jewelry items. Each sale then funds the destruction of weapons in Africa.

Scientists say remains of four men exhumed from what was once an Anglican church suggest they were well-nourished, "high-status" leaders in the early 17th century colony. And one was likely Catholic.

The isle of Cayo Santiago has been home to at least nine generations of rhesus monkeys since the colony's founding in 1938. Primatologists here seek clues to primate kinship, cognition and ecology.

NPR's Robert Siegel talks with Nicola Sturgeon, the Scottish first minister, who is visiting the U.S. for the first time since she took the top spot in Scottish leadership.