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In the 19th century, Bolivar freed six countries from Spanish rule. Almost 200 years later, the warrior statesman is still a widely celebrated Latin American hero, but his story is also little understood. In a new biography, Marie Arana aims to separate fact from fiction.

Many elected officials say there's a link between immigration and crime, and have even passed tough anti-immigration laws as a result. But some researchers say cities with large immigrant populations boast conditions that depress crime: young families and active, bustling neighborhoods.

The United Farm Workers seemed to be all over Washington this week — lobbying members of Congress and gathering for a big immigration rally outside the Capitol. The union has gotten "a huge injection of leverage" from its role in the immigration debate, one analyst says.

At the corner of Crenshaw Boulevard and 28th Street in Los Angeles, you'll find Robert Oliver wearing a Statue of Liberty costume and dancing to promote Liberty Tax Service. "I'm never embarrassed to be out here," he says. "I'm proud of what I do."

"What's good for the heart is good for the brain," one neuroscientist says. In addition to physical exercise, researchers say mental exercise, socializing and a good diet can help preserve memory.