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NPR's Martin Kaste continues the week-long series on Latin American cities with a report on Buenos Aires, Argentina. Since Argentina's economy collapsed in 2001, there have been great disparities in wealth and widespread corruption throughout Buenos Aires.

In the first of a series of speeches on the economy, Sen. John Kerry outlines tax incentives he says will create 10 million new jobs. At a rally in Michigan -- a state hard hit by job losses in recent years -- Kerry calls for a cut in corporate taxes and elimination of tax benefits for businesses that "outsource" jobs overseas. NPR's David Welna reports from Detroit.

He calls his latest project a "musical novel." It's a new CD, Greendale, a 10-song cycle with his band Crazy Horse, set in a fictional California seaside town. He also shot a feature film version on Super8, which made the film festival circuit and will be in wider distribution in April.

Commentator David Greenberger has a personal appreciation of the music of Ella Johnson. With her brother Buddy Johnson, a bandleader, the singer was a regular fixture on the New York City club circuit in the 1940s and 1950s. She had many popular hits, including "Since I Fell for You," "Did You See Jackie Robinson Hit that Ball?" and "When My Man Comes Home." Johnson died last month at age 86.

NASA plans to test an aircraft this weekend designed to fly seven times the speed of sound, using an innovative engine called a "scramjet." The test is part of an effort to develop missiles that can reach any target on Earth within two hours, and spacecraft that can transport people and cargo more cheaply. NPR's David Kestenbaum reports.

NPR's Joe Palca reports on new evidence that that there was once a pool of liquid, salty water on Mars. The finding suggests the planet could have supported life.

With orchestras clamoring for her work, the rising artist feels a responsibility and opportunity to help reframe classical music and the institutions that present it.

Four leading Internet service providers announce they are filing civil lawsuits against hundreds of people, accusing them of sending unsolicited e-mails, known as "spam." The suits cite the CAN-SPAM Act passed last year. The companies filing the suits are EarthLink, Microsoft, Yahoo! and AOL. NPR's Larry Abramson reports.

As violence continues to rock Iraq, assassinations targeting religious and political leaders of the minority Sunni and Kurd communities are becoming increasingly prevalent. Residents of Kirkuk are still reeling from the recent murder of a Kurdish city council member. Hear NPR's Steve Inskeep.

Health care officials say the United States is experiencing a shortage of geriatricians. Although more doctors are needed to care for elderly patients, the number of geriatricians has shrunk by 30 percent. Medical educators are resorting to new methods to attract medical students to the specialty. Madge Kaplan from member station WGBH reports.