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Pharmaceutical company Pfizer announces that its popular painkiller Celebrex may increase the risk of cardiovascular problems. New study results indicate more than double the risk of major heart problems, but another study failed to corroborate the finding. NPR's Richard Knox reports.

U.S. and Iraqi forces move against insurgents in the area known as the "triangle of death," south of Baghdad. U.S. commanders say they need to press into neighborhoods where rebels have taken refuge. Iraq's defense minister has signaled that another offensive is planned for the capital itself. NPR's Anne Garrels reports.

President Bush and Sen. John Kerry hit the campaign trail after the first presidential debate of the 2004 campaign, seeking momentum in attracting voters. Kerry spoke in Florida, while President Bush visited Pennsylvania and New Hampshire. Hear NPR's Scott Horsley and NPR's Don Gonyea.

The fighting in Fallujah rouses strong -- but mixed -- emotions among Iraqis. It is also triggering further violence in several parts of the country. Insurgents reportedly mounted the third major attack on the Iraqi police within four days, storming their bases in Baquoba, 40 miles from the capital. Hear NPR's Philip Reeves.

American and allied Iraqi government forces push into the center of Fallujah in the second day of an offensive meant to expel insurgents from the city. The military expects several days of tough urban fighting. Hear NPR's Anne Garrels.

President Bush announces Michael Leavitt as his choice for secretary of Health and Human Services, replacing Tommy Thompson. Leavitt, a former governor of Utah, is now administrator of the Environmental Protection Agency and was not among the expected choices. NPR's Don Gonyea reports.

Doctors in Vienna say Ukrainian presidential candidate Viktor Yushchenko was poisoned by dioxin. The opposition leader has suffered from stomach ulcers, severe acne and terrible pain since the fall. What are the effects of dioxin? Hear NPR's Jennifer Ludden and Dr. Arnold Schecter, of the University of Texas School of Public Health.

Three years after American-led forces in Afghanistan overthrew the Taliban, newly elected President Hamid Karzai takes the oath of office. In a short speech, Karzai said Afghanistan has left its dark past but the fight against terrorism is not over. Hear NPR's Renee Montagne and Washington Post reporter John Lancaster.

NASA is considering an unprecedented robotic mission to save the Hubble Space telescope. But a final report from the National Academy of Sciences says the robotic mission probably won't be ready on time to save the telescope. It strongly recommends sending astronauts instead. NPR's David Kestenbaum reports.

At an auction in Moscow, a little-known investment group purchases oil producer Yukos' largest subsidiary for $9.3 billion, about half its value. The Russian government says Yukos owes $28 billion in back taxes. Hear NPR's Renee Montagne and Natalie Nougarede of Le Monde.