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President George Bush calls Sen. John Kerry to congratulate him for the Tuesday wins that likely clinched the Democratic nomination for Kerry. The Bush-Cheney campaign is reportedly set to begin its media campaign later this week. Hear NPR's Robert Siegel and NPR's Don Gonyea.

Sen. John Edwards heads back to North Carolina, reportedly to announce the end of his presidential campaign after failing to capture any of the 10 states in Tuesday's contests. Hear NPR's Melissa Block, NPR's Mara Liasson and NPR's Adam Hochberg.

A group of researchers is challenging the popular theory that the disappearance of dinosaurs on Earth was caused by the planet's collision with a single asteroid 65 million years ago. The scientists say the Yucatan Peninsula's Chicxulub crater -- often thought to be the result of the catastrophic strike -- is too old to have been involved in the creatures' demise. NPR's Richard Harris reports.

Heroin in the United States is cheaper and purer than perhaps ever before, creating a growing addiction crisis in communities not typically associated with the drug. John Walters, director of the Office of National Drug Control Policy, says federal officials are trying to curb the supply of heroin by targeting countries, such as Mexico and Colombia, that supply it. Hear Walters and NPR's Bob Edwards.

Sen. John Kerry celebrates his near-sweep of the 10 presidential contests Tuesday, with some 1,100 delegates at stake. Kerry thanked his supporters -- as well as his rival, Sen. John Edwards. Edwards, who earlier complimented Kerry on his victory, will reportedly drop out of the race Wednesday. Hear Kerry, NPR's Melissa Block and NPR's Scott Horsley.

President Bush marks the first anniversary of the start of the U.S.-led war in Iraq. In a White House address, President Bush says that every country has a duty to "fight and destroy" the threat of terrorism. Hear NPR's Bob Edwards and NPR's Don Gonyea.

C-SPAN, the network known for its no-frills coverage of Congress, politics and books, turns 25 Friday. NPR's Bob Edwards talks with C-SPAN President and CEO Brian Lamb.

One year ago, the United States and Britain began the military campaign to overthrow Iraqi ruler Saddam Hussein. This is an audio montage of President Bush, Secretary of State Colin Powell and others who were some of the voices in the news leading up to the war in Iraq.

From Mexico City's police corruption to S?o Paulo's squatters and air pollution in Santiago, Chile, Latin America's cities are struggling to overcome economic and social problems. NPR's Gerry Hadden and NPR's Martin Kaste profile some of the region's biggest cities in a Morning Edition series.

Abortions will still be legal in the state of Illinois if the U.S. Supreme Court overturns the federal constitutional protections enshrined by the 1973 Roe v. Wade decision.