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Anthropologists find that the use of "emotional" words in all sorts of books has soared and dipped across the past century, roughly mirroring each era's social and economic upheavals. And psychologists say this new form of language analysis may offer a more objective view into our culture.

In a 16-year study, adults who ate fish regularly lived longer and were less likely to die of heart disease, bolstering doctors' recommendations to eat one to two servings of fatty fish per week.

Calling it "the next great American project," the president predicted that the initiative could "be transformative." The lives of "not just millions, but billions of people" will be improved if more can be learned about brain disorders, said Obama.

A little over a decade ago, Sierra Leone was in the grip of a brutal civil war that tore the country apart. Today, the economy is on the mend and it's moving forward with reconciliation and reconstruction. Host Michel Martin speaks to Sierra Leone's president Ernest Bai Koroma to find out more about his challenges and successes.

At age 13, Farzana Wahidy was beaten in the street for not wearing a burqa. To have carried a camera then would have been unthinkable. But she went on to become a pioneering photographer and, after working and studying abroad, returned to Afghanistan to "show the bigger image, not just show we have problems."

Before the American Revolution, a huge tree has been standing in central Missouri, growing to 90 feet tall. The beloved bur oak, which everybody calls "The Big Tree," has survived all kinds of punishments during 350 years on the prairie. But last year's record drought was rough on the tree, causing it to wilt and alarming two locals who nursed it back to health.

About 1.2 million people die prematurely every year in China from exposure to outdoor air pollution. Smog has dogged the country as it grows at an explosive rate and burns huge quantities of fossil fuels. But there are signs that the government is beginning to take the issue more seriously.

Last year there were just over 200 cases of polio in remote parts of Nigeria, Afghanistan and Pakistan. Now, a new $5.5 billion plan aims to eliminate the disease for good by 2018.

For years, non-baseball experts have been ringing the death knell for this game. But sports commentator Frank Deford says popular team games are so deeply ingrained in our culture that they're here to stay.

The president is trying to regain traction for federal gun control measures by visiting states that are moving forward on their own. Today he speaks in Colorado, where public outrage in the wake of mass shootings helped propel new legislation — and where opponents are promising political payback.