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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.

Business and labor groups are weighing in on proposed immigration legislation. The Chamber of Commerce and the AFL-CIO are both against certain provisions in the bill. But agri-business interests are backing the proposals.

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.

Fresh Air's TV critic previews the new series Breaking Bad, about a cancer-stricken chemistry teacher who decides that cooking crystal meth is the best way to support his family after he's gone. The show premieres on the AMC cable channel on Jan. 20.

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.

Los Angeles County's annual homeless count came out Friday and shows a double-digit increase over last year. The pandemic is also causing future homelessness projections to skyrocket.