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The monthlong lull in the Republican debate cycle may have come as a welcome break to some likely voters and political observers. The debates will be back soon enough. But turn away from them at your own risk — it's precisely at this point in the campaign season when they might be most decisive.

What's the difference between primaries and caucuses, and why do states have different systems for choosing delegates? Political scientist Josh Putnam explains how delegates are picked, and how the process changed after the 1968 Democratic National Convention.

NPR's Andy Carvin covered the uprising in Libya virtually, but now he'll see the country and its people in person.

The United States and five other nations are embarking on a new program to limit pollutants connected to global warming. But they're not targeting carbon dioxide with this effort — instead, they're looking at methane gas, and soot.

Positioned above a tank full of stingrays at the National Aquarium, Weilerstein used her cello to serenade sea creatures (and many pleasantly surprised visitors) with music by Johann Sebastian Bach.

The findings mean pygmy goats join the ranks of humans, bats and whales as mammals with vocal plasticity.

Pianist Simone Dinnerstein drops by to perform a new set of variations on the iconic song "Suzanne."

Dietary cleanses that promise immediate detoxification are all the rage this time of year. But experts say the body is naturally quite good at getting rid of most toxins and doesn't need a lot of help.

Slogans for Las Vegas restaurant the Heart Attack Grill include "Taste worth dying for." But the burger joint's shtick of serving "quadruple bypass" burgers collided with reality Saturday, when a patron suffered a heart attack while eating at the restaurant.

Amanda Knox, the U.S. college exchange student who won an appeal to overturn her murder conviction in Italy last October, has signed a deal to write a memoir — for which she'll earn nearly $4 million, according to reports.