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Vin Gupta, a critical-care physician with military experience and a scientist at the Institute for Health Metrics and Evaluation, talks about the U.S., Mexico, South Africa and Afghanistan.

The man the U.S. alleges is the top al-Qaida operative who orchestrated the 1998 bombings of the U.S. embassies in Kenya and Tanzania has pleaded not guilty to the charges at a federal court in Manhattan. The case has brought the High Value Interrogation Group back into the spotlight. It was created by the Obama administration to extract valuable intelligence from terrorists, but national security experts say there have been too few cases to judge its promise.

Decades ago, amid fears of rapid population growth, a biologist and an economist made a bet about how many people the planet could sustain. Global population is now estimated to top 7.1 billion. So who won the famous bet?

The Olympic sport of curling is a combination of bowling, bocce ball, billiards and chess — all on ice, and with some sweeping involved. NPR's Tamara Keith spent some time learning how to curl, and put together this cheat sheet.

Top overall seed Louisville will face Wichita State at the Georgia Dome next Saturday, while Michigan takes on Syracuse in the other national semifinal. The winners advance to the April 8 championship.

Gov. Chris Christie is defending the state's $225 million settlement for decades of contamination at two refineries as a "good deal." But Democratic lawmakers and environmentalists say otherwise.

The little box is for presidential public financing. At first, it was relatively popular, but now fewer people are checking the box — and more candidates are rejecting the funds.

A trawling experiment in the Gulf of Maine aims to scoop up abundant and profitable flatfish, while bypassing the once plentiful but now depleted cod population. So far, the results are promising.

The vote is illegitimate, Ukraine's leaders in Kiev and Western governments say. Separatist leaders say Sunday's referendum shows strong support for secession; recent surveys tell a different story.

The Media Research Center says its survey shows that news stories on the nation's Spanish-language television networks are dominated by partisans on the left — and conservatives should be concerned.