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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.

In ski jumping, athletes hurtle off ramps at 60 miles per hour and fly the length of a football field. How do they do it? Melissa Block talks with John Eric Goff about the physics behind the event at the Winter Olympics. Goff is head of the physics department at Lynchburg College in Virginia and author of the book Gold Medal Physics: The Science of Sports.

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.

U.S. speedskating took a big hit in Sochi today, coming out of the 1,000-meter competition with no medals. The team's highest rank was eighth, earned by Shani Davis, who has dominated this race in the past.

The multitalented Sid Caesar, who took live and complex comedy skits on the air as a pioneer in 1950s TV, has died at 91. Caesar, who established a new comedic tradition in America before he was 30, died in Los Angeles this week.

Schools across the country are running out of the planned snow days they'd put in place to deal with bad weather. As winter's blast of frigid temperatures and snowy conditions drags on, some school districts have kids at home completing assignments online while others are figuring out ways to deal with lost school days.

Slightly more women than men are signing up for coverage. The most popular plans are the silver ones, the third-most generous type among the four main kinds offered on insurance exchanges around the country.

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.