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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.

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.

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.

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.

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.

Massachusetts Sen. John Kerry collects lopsided wins in Tuesday's primaries in four Southern states, edging closer to clinching the Democratic nomination for president. Turning his attention to the November election, Kerry ratchets up his attacks on President Bush and steps up efforts to raise $80 million in campaign funds. Hear NPR's David Welna.

A relatively new drug, Buprenorphine, allows almost immediate and painless withdrawal from heroin. Doctors say the drug is especially helpful for people early on in addiction. It removes the craving for heroin, and the addict is then gradually taken off the drug. NPR's Patricia Neighmond reports in the conclusion to a five-part series on heroin in America.

Hunt-Broersma picked up the sport after her left leg was amputated below the knee in 2001 and people told her she couldn't run. She set out to prove them wrong and never looked back.

A leaked draft opinion published by Politico suggests that earlier this year a majority of Supreme Court justices supported overturning the 1973 case Roe v. Wade that legalized abortion nationwide.