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Rick Santorum racked up two wins in the South, Newt Gingrich vowed to stay in the race until Tampa, and Mitt Romney failed to put doubts about his candidacy to rest.

Also: Japan is shaken by series of earthquakes; Santorum wins in Alabama and Mississippi; Obama and Cameron plan noon ET news conference.

Saturated fat, the stuff in meat and dairy foods, was associated with lower sperm counts, in a study of 99 men who were clients of fertility clinics. The results, though preliminary, suggest there's something men can do to boost the odds their sperm are up to their evolutionary task: eat better.

The American and British leaders reaffirmed their commitment to gradually withdrawing most forces by the end of 2014.

Bahamas is the stage name used by Canadian singer-songwriter Afie Jurvanen, who put out his first album in 2009. His second album, Barchords, is a measured look at the end of a lengthy relationship.

Listen to conversations these days, and you may notice that responses such as "thank you" and "you're welcome" have fallen by the wayside in favor of the casual "got it" and "you bet." Are we finding new ways to say old, polite phrases? Are good manners merely morphing? Or are they fading away altogether?

All was not gloom and doom for the on-again, off-again, on-again frontrunner for the Republican presidential nomination. A new Pew Research poll indicated that Romney was once again the clear favorite nationally among Republicans and GOP-leaning independents for the nomination, leading Rick Santorum 33 to 24 percent in a poll that was in the field through Sunday.

In October of 2011, Terry Thompson opened the cages of dozens of wild animals on his farm in Ohio — lions, bears, leopards, tigers, monkeys and wolves — and then shot himself in the head. The nearby city of Zanesville was put on lockdown as police tracked and killed many of the escaped animals.

The Karnes County Civil Detention Center in Texas will house mostly low-risk detainees awaiting deportation or facing court. With features like a pharmacy, commissary and soccer field, it's a departure from other Immigration and Customs Enforcement facilities that critics have called excessively harsh.

Two British women believe they have the right to wear a cross in the workplace. Both were fired after refusing to remove the necklaces. Their employers state the jewelry does not comply with uniform policy, and that wearing a cross is not a requirement of Christians. Lucy Kellaway, a columnist for the Financial Times in London, talks to Renee Montagne about the case.