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South Korean scientists report a major advance in the production of stem cells for medical research. Scientists say they have discovered a more efficient method for making new cells. In the United States, embryonic stem cells are at the center of a political and ethical debate.

The "Chicago Boys" -- Chilean men who studied free-market economic theories at the University of Chicago in the 1950s and '60s -- are often credited for Chile's relatively healthy economy. Chicago Public's Catrin Einhorn reports from Santiago on their legacy.

The Army may have met its recruiting target for July, but the year-to-date goals have not been met. The Army Reserve and the National Guard have also suffered shortfalls in their recruiting missions. Can the United States continue to rely on an all-volunteer army? Melissa Block talks with Laurence Korb, a senior fellow at the Center for American Progress.

NASA officials say the agency's engineers have found no easy answers to the problem of falling foam during the liftoff of space shuttles -- and a scheduled September launch will likely be delayed. Two NASA engineering teams reported on the problem Thursday.

New York City officials release thousands of pages of oral histories collected from emergency responders in the days after the Sept. 11 attacks. Also released were radio transmissions between 911 dispatchers and fire crews, visceral reminders of the confusion and horror of that day.

Day to Day sports reporting brothers Randy and Jason Sklar tell Madeleine Brand about their trip to the monkey cages of the Los Angeles Zoo, where they met Marc Lewis, the winner of the Hairiest Back in Los Angeles contest.

Five years ago, Tom DeBaggio told his personal story about his battle with early-onset Alzheimer's. A return visit finds the former nursery owner less sure of himself — and scared to death of getting lost again.

Pere David's Deer was near extinction before a French missionary helped rescue it at the turn of the 19th century. The animal's story may reflect new environmental awareness in China, despite social and economic pressures still threatening the country's wildlife.

Sgt. 1st Class Paul Smith will posthumously receive the Medal of Honor, the nation's highest military award. Army officials credit his heroism in a firefight in Baghdad two years ago with saving dozens of American lives.

The Pentagon recommends closing 33 major bases and realigning another 29. In total, it seeks to shut more than 150 military installations. The government estimates the cuts would result in a net loss of 29,000 military and civilian jobs at a savings of nearly $49 billion over 20 years. It is the first round of base closings proposed in a decade.