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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.

President Bush will soon declare an official end to the war in Iraq and outline his plans to rebuild that country, White House officials say. Meanwhile, U.S. military officials say water and electricity have been restored to large portions of the Baghdad. NPR News reports.

Chinese health officials report seven more deaths from Severe Acute Respiratory Syndrome, raising China's SARS-related deaths to 122. In Beijing, a second hospital is sealed off and 4,000 residents are under quarantine. Disease experts urge people to heed travel advisories. Hear NPR's Rob Gifford and NPR's Linda Wertheimer.

More than half of the cases of SARS reported so far have occurred in China, where officials say 115 people have died and more than 2,600 are infected. NPR's Melissa Block talks with Chen Min, a Beijing teacher, about life with SARS; and with Shannon McEwan about the situation in Wuhan, in Central China, where she teaches English at a private school.

Host Bob Edwards speaks with NPR's Guy Raz on the capture of Tariq Aziz, deputy prime minister in the former Baath Party government of Saddam Hussein. He is the highest-ranking Iraqi government official so far apprehended by the United States.

She is professor of history at the University of Toronto and the author of the new book, Paris 1919: Six Months That Changed the World, about the Peace Conference after World War I in which delegations from around the world convened to find an alternative to war. During the six months of the conference, new boundaries were drawn up in the Middle East. Out of that conference Iraq was born, and was for a time under British control. MacMillan's book, published under the title Peacemakers in England, was the winner of the Samuel Johnson Prize.

An important Iraqi intelligence official is in U.S. custody. Farouk Hijazi was accused of planning a plot to assassinate the first President Bush in the early 1990s. A Pentagon official says Hijazi met with Osama bin Laden in 1996. Defense officials hope his capture will produce valuable new information. NPR's Tom Gjelten reports.

For many, the best analogy for the way DNA works is that it's like a computer program at the heart of every cell. Some of its programming tricks bear an uncanny resemblance to ones the human brain has dreamed up. But DNA also works in ways human programmers find entirely alien. David Kestenbaum takes the occasion of the 50th anniversary of the first scientific description of DNA to speak with researchers trying to understand this odd and extraordinary piece of "software," which is the product of billions of years of evolution.

One of the few major encounters with the Iraqi Republican Guard the U.S. Marine's 1st Division encountered during its drive to Baghdad was at the small Tigris river town of Aziziyah. NPR's John Burnett was with the 1st Division as it moved on to Baghdad. He retraces his steps to see what the battle was all about. He discovers what appears to have been an accidental U.S. bombing of a village near Aziziyah in which 31 civilians were killed as they slept.

Shoba Narayan has written about her journey from southern India to the United States in her new book Monsoon Diary: A Memoir with Recipes, celebrating food, family ties and Indian culture. View a video of Narayan demonstrating the correct way to cook vegetable dosa, and get recipes for some of the other dishes featured in Lynn Neary's report.