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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.

NASA's Curiosity rover will soon begin to search for signs of life, past or present, on the red planet. But can we make sense of life in strange places? And if we don't find it, what will it mean to us?

Journalist Karl Fleming chronicled many of the key moments in the civil rights era in the South. He then moved to Los Angeles, where he was beaten during the 1965 Watts Riots. Fleming died last weekend at age 84.

While the state's highest court could make a ruling before Election Day, new voter ID laws also are in court or under Justice Department review in several other key states.

During a festival this week at the Bill & Melinda Gates Foundation, scientists from around the world showcased the latest toilet technologies. Bill Gates himself awarded top-performing commodes, including a solar-powered toilet and one that dehydrates waste within 24 hours.

"Ecuador is not a British colony," Ecuador's foreign minister said angrily.

In upstate New York, county officials are scrambling to sell off nursing homes that have been taxpayer-funded for generations. Horace Nye Nursing Home in Elizabethtown, N.Y., was part of a wave of privatizations in rural counties across the state.

At the center of the cluster is one huge galaxy that's giving birth to new stars at an astonishing rate. The discovery is described in the journal Nature. And it should force a rethink of how galaxies and galaxy clusters evolve.

When Republican Mitt Romney tapped House budget chairman Paul Ryan to be his vice presidential running mate, the decision forced both campaigns to focus on Medicare. The Ryan pick was a 180-degree turn from Romney's original premise, which was to focus exclusively on President Obama and the economy.

West Nile virus has hit Dallas County, Texas, hard this year. Officials there have declared a state of emergency against the mosquito-borne illness. For the first time in decades, they plan to begin aerial spraying to control the mosquito population.