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Humanitarian groups are finding cheaper ways -- namely, filtering systems -- to clean up contaminated drinking water in developing nations. That could greatly reduce diseases caused by bacteria, viruses and parasites among the billion people worldwide who drink unsafe water.

Scientists have developed vaccines that protect against the deadly Ebola and Marburg viruses. They hope to test the vaccines -- successful in experiments with monkeys -- on humans in two to three years. The viruses are at the top of experts' list of bioterrorism threats.

Kansas City's Carter Broadcast Group is the country's oldest Black-owned radio company. Currently Black ownership nationwide represents less than 2% of the market and is on the decline.

One brigade slated for deployment to Iraq this summer will instead be staying in Germany, courtesy of the Pentagon's reassessment of troop levels. Will political progress in Baghdad allow the Defense Department to lower U.S. force levels in the weeks ahead?

There's an unusual bi-partisan effort to get the Environmental Protection Agency (EPA) to release information about certain Superfund cleanup sites, pieces of land that have been deemed too toxic for development. The EPA says sharing some information about the sites could discourage companies from cleaning up their environmental messes.

"Within seconds we realized, oh my God, a pack of killer whales is attacking a blue whale," researcher John Totterdell from the Cetacean Research Centre in Australia, told NPR.

For fans of the Iditarod, there's a way to get up close to the sled dog race without ever going outside: fantasy mushing. It's a collaboration between coder David Hunt and musher Danny Seavey.

Billions of people rely on glaciers for drinking water, hydropower and irrigation. A raft of new research suggests there is less ice left than previously thought.

March Madness is hitting a fever pitch, as only the last "Sweet 16" teams are left standing on the men's and women's brackets.

The trees in the El Yunque National Forest in Puerto Rico were raked bare by Hurricane Maria. Grizelle Gonzalez from the International Institute of Tropical Forestry talks with NPR's Melissa Block.