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Pope Francis arrived in Rio de Janeiro on Monday and was greeted by adoring masses and protesters alike. It is his first foreign trip since becoming pope.

A former prime minister and a candy billionaire lead the pack of presidential contenders for the May election. One big question is whether voters in Crimea, which Russia now controls, will have a say.

A soldier who was undergoing assessment to determine whether he had post-traumatic stress disorder opened fire on Wednesday at the base. Four people are dead including the shooter, who killed himself.

Journalist Matt Taibbi investigates the differences between punishment for white-collar and blue-collar crimes in The Divide. He also questions beliefs about who is "appropriate for jail."

The Ukrainian government says it has begun an operation to retake the eastern Ukrainian town of Slovyansk from pro-Moscow militants. Militants there have already shot down two government helicopters.

As Ukraine seeks international help to bring Crimea back from Russian control, residents of Odessa watching warily. The historic Black Sea port has been conquered repeatedly throughout history.

Congressional Republicans say they want to repeal and replace Obamacare, but they've been light on details of what the alternative might look like.

With little relief in sight for California's record drought, scientists are trying to learn why some clouds rain and other don't. As Lauren Sommer of KQED says, they're finding surprising answers.

Russia is in the middle of a planned upgrade and expansion of its military forces, but global affairs professor Mark Galeotti tells NPR's Arun Rath that Russia's military has its limits.

Democratic Rep. Bruce Braley was considered the favorite to capture the state's open U.S. Senate seat. But an injudicious remark he made about veteran GOP Sen. Charles Grassley has unsettled the race.