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Secretary of State Colin Powell provides detailed evidence against Saddam Hussein to the U.N. Security Council and lists ways America says Iraq is continuing to develop weapons and help terrorists. Iraq's U.N. ambassador responds. Hear reports from NPR's Vicky O'Hara and NPR's Michele Kelemen.

Defense Secretary Donald Rumsfeld, in Europe to rally support for regime-change in Iraq, says he doesn't know how long a war in Iraq would last, but doubts it would take six months. Meanwhile, Arab leaders have tried to avert conflict in Iraq, but many now say hope for a peaceful solution is fading fast. Hear reports from NPR's Tom Gjelten and NPR's Kate Seelye.

Search crews near Fort Worth find a large segment of wing from space shuttle Columbia. It could provide important clues about the cause of Saturday's disaster. NASA continues to study photos taken by the Air Force in Columbia's final minutes of flight, reportedly showing damage to the craft's left wing. Hear from NPR's Richard Harris.

The White House prepares to reveal intelligence to the U.N. Security Council in hopes of persuading reluctant members that Iraq remains in defiance of U.N. resolutions on weapons. Secretary of State Colin Powell is to present the evidence Wednesday. NPR's Vicky O'Hara reports.

President Bush sends Congress a 2004 budget totaling $2.23 trillion, with the largest increases going to defense and homeland security. But some in Congress say the president should scale back some of the proposed tax cuts and allow more social spending. NPR's David Welna reports.

Secretary of State Colin Powell prepares to share U.S. intelligence with the U.N. Security Council Wednesday, in hopes of persuading members that Iraq is in defiance of U.N. weapons resolutions. Meanwhile, British Prime Minister Tony Blair meets with French President Jacques Chirac to discuss Iraq. NPR's Nick Spicer reports.

At the Johnson Space Center in Houston, President Bush joins thousands of mourners for a memorial service honoring the seven astronauts who died when the space shuttle Columbia broke up on re-entry Feb. 1. NPR's Wade Goodwyn reports.

NASA administrator Mike Kostelnik says there was no reason to think that possible damage to the space shuttle Columbia on liftoff was reason for concern. Meanwhile, the agency expands the search for debris, establishing a second collection site in Texas. NPR's Debbie Elliott reports.

The companies studied a 10 microgram vaccine dose in children 5 to 11, a third of the dose used for adults, to minimize side effects and because it still prompts a strong immune response.

On Fridays, kids and parents hop on their bikes and join the bicibús, or bike bus, traveling to three schools along its route. It promotes bike safety and environmentally friendly transportation.