NPR Staff

Should the president of the Navajo Nation be required to speak fluent Navajo?

The Navajo Nation held a referendum on that question this week, and the majority voted no.

The vote was victory for supporters of a Navajo presidential candidate who was disqualified last fall because he didn't speak the language fluently. The next Navajo Nation election is in 2018.

In Angola, a civil war that raged for decades has left lingering, and dangerous, reminders of the violence across the countryside. Long since the worst of the fighting ended in 2002, land mines continue to claim lives — and not just those of humans.

Even as the elephant population there saw a replenishment in numbers following the war, many of the mammoth animals were being killed by leftover land mines, as well.

Advertising is the basic business model of the Internet. It's one reason we can view online content free of charge.

Millions of Web surfers already download software to block ads online, and that number is growing. Soon, Apple could be making mobile ad blocking easier.

In one of this year's most intense international competitions, the United States has come out as best in the world — and this time, we're not talking about soccer.

This week, the top-ranked math students from high schools around the country went head-to-head with competitors from more than 100 countries at the International Mathematical Olympiad in Chiang Mai, Thailand. And, for the first time in more than two decades, they won.

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