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A new study from Stanford University suggests that pollution from ethanol could be even worse than from traditional gasoline. Study author Mark Jacobson, of Stanford's department of civil and environmental engineering, explains.

The new head of the U.N. World Food Program is visiting Darfur, where more than 200,000 people have been killed and millions have been displaced by fighting between African rebels and Arab militias known as janjaweed, which are backed by government troops.

Immigration rights activists are calling for rallies and boycotts Tuesday against a federal crackdown on undocumented workers. In Chicago, one woman has avoided deportation for eight months by taking refuge in a church.

The prosecution appears close to resting its case in the perjury and obstruction of justice trial of Lewis "Scooter" Libby, former chief of staff to Vice President Cheney.

White House spokesman Tony Snow downplays news of an attack on a U.S. military base at Bagram, Afghanistan, where Vice President Dick Cheney had just spent the night. Estimates of the death toll have gone as high as 23; the Taliban calls the attack an attempted assassination.

The West African nation of Guinea has been under a state of emergency for nearly two weeks. A 12-hour curfew is in place. A crippling union-led strike prompted waves of anti-government demonstrations and riots.

After decades of success, director Martin Scorsese has his first Oscar. His film The Departed also won Best Picture. Among actors, Forest Whitaker was honored for playing Idi Amin in The Last King of Scotland, Helen Mirren for The Queen.

The Senate voted Wednesday on a bill that would expand federal funding for embryonic stem-cell research. The bill passed 63-34. But President Bush has reiterated his plans to veto the legislation. Whether the Senate can override a veto is uncertain.

The Democratic Congress promised to work with the White House. But after four months, the rhetoric and the political atmosphere remain contentious. The latest example: the impasse over funding the wars in Iraq and Afghanistan.

An explosion tore through the cafeteria of the Iraqi parliament building Thursday, apparently from a suicide bombing. The Baghdad Convention Center is within the heavily fortified Green Zone. At least eight people, including lawmakers, were killed.