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Aaron Alexis, who police say killed 12 people at the Washington Navy Yard, had a troubled service record and showed signs of mental instability. But the former Navy reservist's past did not prevent him from obtaining a secret-level security clearance or access card.

Compared to the rest of the world, American schools don't stack up like they used to. But what's the best way to educate children? Author Amanda Ripley followed students and teachers across the globe to find out for her new book, The Smartest Kids in the World: And How They Got That Way.

Brilliant.org is an online hub for the world's most promising young minds to come together, connect, and see how they measure up against one another.

As the Cairo bureau chief for The New York Times, David Kirkpatrick has covered events in the region since January 2011. He says that the toppling of the democratically elected Egyptian President Mohammed Morsi throws the changes of the Arab Spring into question.

NPR tracked down former top spellers to see how they're faring, decades after their early successes.

Maricopa County, Ariz., which for years has been ground zero in the debate over immigration, is now the center of an interesting trend. Undocumented immigrants inspired by the state's tough immigration law are among those mobilizing Latino citizens to vote in the November presidential election.

After lifting President Obama to re-election, African-American and Hispanic advocacy groups want him to champion initiatives that will specifically benefit minorities.

Look for more of what President Obama exhibited three weeks ago at his inaugural address: a challenge to Congressional Republicans, and a focus on the economy, immigration, gun control and climate change.

Widespread police brutality under Hosni Mubarak helped fuel the uprising of 2011. But two years later, many say the police have begun to act like armed gangs, meting out collective punishment in restive areas. The police say they are the victims, under attack by anti-government protesters.

Two white supremacist prison gangs have fallen under suspicion in recent high-profile slayings in Colorado and Texas. Experts say prison gangs of all races and ethnicities have evolved in recent years to include more activity outside the walls.