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South Korean and U.S. researchers say they have successfully cloned a human embryo and extracted embryonic stem cells from it. The experiment, reported in the journal Science, is the first instance of cloned human stem cells -- an important step toward therapeutic cloning, in which patients' own replacement tissue would be generated to treat them. NPR's Joe Palca reports.

North Carolina Sen. John Edwards' failure to win either of the two Southern primaries up for grabs Tuesday has led some to question the future viability of his presidential campaign. Edwards says he plans to campaign in Wisconsin each day until the state's Feb. 17 primary, and has no intention of withdrawing from the race. NPR's Adam Hochberg reports.

A new book investigates Operation Condor, the secret alliance between six Latin American military dictatorships in the 1970s. It was formed to track down the regimes’ enemies and assassinate them. Author John Dinges is a former managing editor of NPR News, and has written for The Washington Post and Time. He teaches journalism at Columbia University. His book is The Condor Years: How Pinochet and his Allies Brought Terrorism to Three Continents.

Commentator Andrei Codrescu describes discovering a new sound called "Mesh Music" in New York. It's a combination of Balkan and Gypsy melodies, and he thinks it will be the big thing later this year.

Comcast, the nation's biggest cable provider, makes an offer worth $66 billion to purchase the entertainment giant Disney. Comcast officials say Disney chief Michael Eisner rejected a merger offer last week, prompting the public purchase bid. The price is based on around $54 million in stock and $11.9 billion in Disney debt. Hear NPR's Kim Masters.

U.S. military operations in Iraq and Afghanistan, along with requirements that troops receive more live-fire training, have created the highest demand for small-caliber ammunition since the Vietnam era. Capacity is severely strained at Lake City, the U.S. Army's sole ammunition plant. Hear NPR's Greg Allen.

Sen. John Kerry of Massachusetts wins the Democratic caucuses in Washington state, and holds a commanding lead as votes are counted in Michigan. Hear NPR's Steve Inskeep, NPR's Wendy Kaufman and NPR's David Schaper.

Vice President Dick Cheney has been under scrutiny for his ties to Halliburton, where he was once CEO. Halliburton won $7 billion in no-bid contracts in Iraq. Cheney has said he has not influenced those deals. In this week's The New Yorker magazine, writer Jane Mayer examines the confluence of Cheney's corporate and public careers. Hear Mayer and NPR's Bob Edwards.

The White House releases pay records and other information about President Bush's time in the National Guard. The White House said the new documents support the president's contention that he fulfilled his duty as a member of the Air National Guard during the Vietnam War. Democratic presidential candidates had begun to take up the question of Bush's military service. NPR's Don Gonyea reports.

What year do you think was the worst year for music? Washington Post music critic Tim Page says, without a doubt, it was 1974.