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Scientists at the National Institutes of Health are attempting the first test of an HIV vaccine that could stop the global spread of AIDS. But as NPR's Joe Palca reports, finding volunteers willing to get innoculated with an unproven and possibly harmful vaccine is proving difficult. Learn more about the vaccine program.

In a series of closed hearings, House and Senate committees examine whether U.S. intelligence about possible illegal weapons in Iraq were exaggerated to justify war. Meanwhile, U.S. officials say they expect 20,000 to 30,000 troops from other countries, including the Netherlands, Slovakia, Denmark and the Ukraine, will be in Iraq by August. Hear Dana Priest of The Washington Post and NPR's Michele Kelemen.

The 24-year-old Pittsburgh Steelers quarterback died early Saturday after being struck by a dump truck while walking on a South Florida interstate, the Florida Highway Patrol said.

NPR's Lynn Neary talks with Jacques Perrin, the director of the film Winged Migration, which tells the story of the seasonal migration of birds from a bird's eye view.

As part of his continuing series of stories on the challenges of getting by on a low-wage job in America, NPR's Noah Adams profiles Marzs Mata, a Detroit woman who doesn't have a car, can't afford to live near her job, and spends about five hours a day getting to and from work. Listen to other worker profiles, and see photos of the people profiled.

The Bush administration drafts a plan to investigate mass murders allegedly committed by the Saddam Hussein regime in Iraq. The plan calls for an international effort to exhume mass graves and collect forensic evidence for possible prosecutions. NPR's Christopher Joyce reports.

NPR's Elaine Korry profiles the search engine company that has thrived at a time when so many electronic-based enterprises have failed.

Actor Hume Cronyn died Monday at the age of 91. NPR's Ari Shapiro has an appreciation.

U.S. air and ground troops attack what military officials call a suspected guerilla training camp, killing about 70 anti-U.S. forces. In a separate incident, 27 Iraqi fighters die when a U.S. armored patrol returns fire after coming under attack north of Baghdad. NPR's Eric Westervelt reports.

It's the new chorus of the computer age: "You've got spyware!" It can take the shape of a green alligator, a purple monkey, or a colorful new toolbar that suddenly appears on your Web browser. These stealth programs can fill your screen with a blizzard of pop-up ads, or disable your computer entirely. NPR's Susan Stone reports.