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In the final of four stories marking the 50th anniversary of DNA's discovery, NPR's Jon Hamilton reports that genetic causes of mental illness have proved illusive to find. As scientists began to understand how genetic material controls the human body, they were confident that such research could help unlock the secrets of the brain, but that hasn't happened.

Secretary of State Colin Powell arrives in Damascus, Syria. He's expected to press Syrian leaders to drop support for for Palestinian and Lebanese militant groups that the Bush administration views as terrorist organizations. NPR's Kate Seelye reports.

Once one of the most advanced mental institutions in the region, Baghdad's Al-Rashad Mental Hospital is now struggling to care for its rapidly deteriorating patients. Looters have left the facility without beds, food, anti-psychotic drugs and other critical supplies. NPR's Guy Raz reports.

Gen. John Abizaid and Deputy Defense Secretary Paul Wolfowitz discuss the cost of rebuilding Iraq in a closed-door session with members of Congress. An emergency spending request that could run as high as $100 billion is expected in coming days. NPR's David Welna reports.

Two years ago, a TV picture-tube plant moved from Scranton, Pa., to Mexico and left nearly 2,000 people without jobs. Many of the town's residents are still struggling to find jobs. In the second of this three-part series, NPR's John Ydstie reports on three former plant employees.

In the first of a four-part series, NPR's Howard Berkes reports on John Wesley Powell's vision for developing the western United States. He recognized how serious a restraint the lack of water was in the region, and laid out a plan for how to best use the limited resource.

Phillip Martin reports on the reflections of people in Massachusetts who attended the civil rights March on Washington four decades ago. They talk about their participation in the event, and about what has and hasn't changed in the African-American community since then.

NPR's Elizabeth Arnold reports on the complex system of water rights. Most of these claims date back more than a century. Individuals holding the oldest rights have the best chance of getting the most water.

DNA technology is helping scientists learn more about a rare genetic phenomenon. When two fertilized eggs fuse in the womb, they create a child with two full sets of genes, called a chimera. NPR's David Baron reports.

The Senate starts what promises to be a long inquiry into February's space shuttle Columbia disaster. NASA Administrator Sean O'Keefe faces questions ranging from budgets to affixing blame for the accident, which killed seven astronauts. NPR's Richard Harris reports.