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NPR's Ari Shapiro traveled with presidential hopeful Mitt Romney this week as the campaign swung through Mississippi and Alabama ahead of Republican primaries this coming Tuesday.

Unlike its much-trumpeted presidential superPAC counterparts, the Campaign for Primary Accountability has no million-dollar donors — at least not yet. Its goal is to oust entrenched members of Congress in primary races, regardless of their party.

Metal-on-metal hip replacements fail at faster rates than other types of devices, a new study confirms. People should get regular checkups if they've had a hip replacement, doctors say.

The Islamist group, which controls the Gaza Strip, is undergoing "fundamental change," according to analysts and the statements of its senior leaders. Hamas leaders say there are divisions among the ranks as they try to grapple with where to push the movement.

For years, doctors have recommended that women start getting Pap smears every year or two to try to catch signs of cancer early, when it's easiest to prevent and treat. But new guidelines say that testing every three years is a better idea for most women.

For five seasons, actress Sonja Sohn played Detective Shakima "Kima" Greggs on the critically acclaimed HBO series The Wire, which chronicled life and death on Baltimore's toughest streets. When the series ended, Sohn stayed in Baltimore — to help young people straighten out their lives.

An estimated 70 percent of the ground beef supply contains these lean bits of meat derived from muscle and connective tissue. The industry calls the trimmings Lean Finely Textured Beef.

The student council at the University of California Irvine approved a resolution Thursday demanding that Dr. Hazem Chehabi, Syria's honorary consul in Southern California, be removed from the post of chair at the UC Irving Foundation.

The stock market hit some major milestones this week: The Standard & Poor's 500 index reached its highest level in more than three years and the Nasdaq rose to its highest level in 11 years. Still, the Federal Reserve has been warning not to get too excited about where the economy is headed next.

Redistricting is forcing a handful of congressional incumbents of the same party to run against each other in primaries. Next Tuesday, two Illinois Republicans square off in a battle of experience versus relative youth, Tea Party versus GOP establishment, and conservative versus conservative.