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A long-running study has been raising questions about the value of mammography for younger women, and recently it has produced yet more evidence to cast doubt on routine screening. The study found no evidence that screening saved lives, even after 25 years of follow-up. Rather, screening may lead instead to unnecessary treatment for many women. The findings are unlikely to settle debate over the value of mammography.

As time runs out to put the brakes on global warming, world leaders seem loath to reduce gas emissions, because it's politically hard, says social scientist Clive Hamilton. Instead, he worries, we'll try to engineer the atmosphere — a tech fix that sounds quicker and simpler – but is fraught with risk.

Democratic Sens. Claire McCaskill of Missouri and Kirsten Gillibrand of New York are at odds over whether military commanders should retain control over pursuing prosecution in sexual assault cases.

A debilitating winter storm is creating havoc across the Deep South on Wednesday. As much as a foot of snow is expected in Georgia and the Carolinas. Ice will also be a problem: Forecasters say that up to an inch of it will coat roads and power lines. Jim Burress of member station WABE reports from Atlanta that hundreds of thousands of people are without electricity.

Wednesday in New Orleans, a federal jury convicted former Mayor Ray Nagin on 20 of 21 corruption counts. The two-term mayor was in office when Hurricane Katrina struck and was the public face of the city during the city's rebuilding. Federal prosecutors say that it was during this time he took bribes to steer rebuilding contracts to businessmen.

A huge sinkhole opened beneath part of the National Corvette Museum in Bowling Green, Ky., swallowing eight cars. Robert Siegel talks to Katie Frassinelli, the museum's communications manager.

In Bosnia-Herzegovina, protesters have begun to gather in several towns to demand the resignation of the regional government. Their complaints range from corruption to unemployment, but some say the roots of the unrest can be found in the flawed system established two decades ago, in the wake of sectarian civil war. Robert Siegel speaks with Reuters correspondent Matt Robinson about the changes that need to be made and the unclear path forward.

In the war-torn Syrian city of Homs, a tenuous cease-fire is set to expire on Wednesday. Fighting has centered on a district within Homs known as the Old City, a rebel-held area under siege by government forces for more than a year. For more on the cease-fire and evacuation, Melissa Block talks with Matt Hollingworth, the Syria director for the United Nations World Programme.

A Canadian study finds no reduction in deaths over the long haul for women who got mammograms to detect breast cancer beginning in the 1980s. It's the latest study to raise questions about the value of regular mammograms. But radiologists faulted the study as flawed and rejected its conclusions.

Media report Comcast will announce its acquisition Thursday morning. The merger would combine the country's two largest cable companies and likely draw scrutiny from regulators.