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While better treatment options are being developed for patients with Crohn's, doctors still don't know what causes the disease. Russell Cohen, co-director of the Inflammatory Bowel Disease Center at the University of Chicago Medicine, provides an update on current research.

What does satellite imagery reveal about Hurricane Sandy? Owen Kelley at NASA is using satellite data to visualize the internal structure of the storm and Marshall Shepherd, president-elect of the American Meteorological Society and the director of the atmospheric sciences program at the University of Georgia, discusses what made this storm so unusual.

Truvada, the first HIV prevention pill, costs about $13,000 a year, and it's not clear whether insurers will pay for it. And while taking a daily pill sounds simple, the new prevention strategy involves some complicated issues.

Opening statements will be made Tuesday in the trial of a former Air Force instructor accused of rape and sexual assault of young trainees in his care at Lackland Air Force Base in Texas. Staff Sgt. Luis Walker faces 28 charges and could be sentenced to life in prison. Other instructors are also under investigation.

Europe's largest bank allowed drug cartels to launder billions of dollars through its U.S. operations, and skirted bans against transactions with Iran. Those are among the findings of a Senate investigation of London-based HSBC. Executives from the bank are in Washington for a hearing on the probe.

Yahoo has hired Google executive Marissa Mayer to run the struggling Internet company. Mayer, a 13-year Google veteran, will face a tough task trying to reverse Yahoo's sagging fortunes.

The management and self-help guru's best-known work, The 7 Habits of Highly Effective People, was on The New York Times best-seller list for more than five years. Stephen Covey's family said he died from the effects of a bicycle accident in April.

On reality television, there's a tried-and-true formula for becoming a breakout star: ego and anger plus backstabbing and some sex. But commentator Eric Deggans says it is possible to turn reality stardom into a media empire by being nice.

Kitty Wells, the Queen of Country Music, died at her home in Nashville Monday of complications from a stroke. She was 92. Wells was the first female to score a No. 1 hit on the country charts, and paved the way for other women at a time when the men who ran the industry didn't think a woman could be a headliner.

Officials tell the newspaper that the U.S. is building a missile-defense radar station in Qatar and will hold its "biggest-ever minesweeping exercises in the Persian Gulf." Also, a second aircraft carrier is being sent to the region.