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Divisions among Democrats take center stage as the Senate debates two Iraq amendments to the defense bill. One, from Sen. John Kerry (D-MA), calls for a withdrawal of U.S. forces from Iraq by a certain date. A competing amendment, also from the Democrats, is an open-ended call for the withdrawal of troops. Republicans stand largely united against the amendments.

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.

The House votes in favor of the Central American Free Trade Agreement (CAFTA). Thursday's early morning vote is a victory for the Bush administration. House Republicans had trouble keeping rank-and-file members from defecting as many Democrats opposed the accord.

Bird lovers say they're friendly and intelligent -- but a Connecticut power utility calls them a nuisance, and it's rounding them up to kill them. Tandaleya Wilder of member station WSHU reports on the skirmish over the wild monk parakeet.

Rain runoff from roofs of buildings across the United States adds to the pollution of lakes and streams and can overburden sewage systems and storm drains. But more of those roofs are turning "green." There's a push under way to grow plants on the tops of buildings to capture rainwater and air pollutants.

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.

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.