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In Africa, a nutrition success story: Swapping orange sweet potatoes for white ones is improving the health of children by boosting vitamin A levels. Researchers are now trying to duplicate their success with other crops.

Hours after President Obama paid a visit to a central Iowa farm Tuesday afternoon, the farm owner's adult son issued a statement not exactly in line with the Obama campaign's talking points.

A player at the national Scrabble tournament was kicked out of the competition after he was caught cheating. For more, Audie Cornish speaks to sportswriter and Scrabble aficionado Stefan Fatsis.

The move is the latest salvo in a tense relationship between the state and federal government.

Mitt Romney's running mate has staked out a reputation as a fiscal conservative, opposing the economic stimulus as well as earmarks. But when it comes to helping out his district in southern Wisconsin, Rep. Paul Ryan's principles have been flexible.

It's been more than a week since the Mars rover Curiosity made its successful landing on the Red Planet. Curiosity is by far the most technologically advanced rover to reach the planet's surface. David Greene talks to astrophysicist Neal DeGrasse Tyson, director of the Hayden Planetarium in New York City, about Curiosity's two-year visit to Mars.

Renee Montagne talks to Emily Steel of the Financial Times about Olympic athletes turning gold — into gold. When securing big-money endorsements, it's not just the medals that count, it's the followers and friends, too.

Rebecca Lanier was known to many as the world's oldest person. Her family said she was born in Mississippi in 1892, the child of former slaves. She never officially held the title since didn't have a birth certificate. Lanier passed away on Monday.

Pitcher Felix Hernandez retired all 27 batters in order Wednesday. It was the first perfect game in Mariners' history, and it was the third perfect game this year.

You may have heard about NASA's Curiosity mission to Mars. But you probably didn't know it had a backbeat. Dressed in NASA garb, actors parody LMFAO's music video "Sexy and I Know It."