NPR Staff

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.

President Obama responded sharply this week when a reporter asked if he was "content" to celebrate the nuclear deal with Iran when at least three and possibly four Americans are being held in Iranian jails.

"Nobody's content," he said, "and our diplomats and our teams are working diligently to try to get them out."

At least one former American hostage thinks the deal is worth signing, despite the remaining hostages.

It's easy to think we're being virtuous when we fill up the blue recycling bin and put it on the curb. But it's clear we have embraced some magical thinking when it comes to what can be recycled.

Morning Edition asked its social media followers to share what puzzles them the most about the recycling process. Then, NPR's Dianna Douglas visited a waste management plant in Elkridge, Md., to get the answers from Michael Taylor, director of recycling operations for the plant.

Syria's civil war has created the worst refugee crisis in the world, with more than 4 million people fleeing the country. Millions more have been displaced inside Syria, though we rarely hear from them.

Over the past year, NPR's Morning Edition has spoken three times with Saeed al-Batal, a photographer and filmmaker who doesn't use his real name for security reasons.

The "E" in Wisconsin Gov. Scott Walker's newly unveiled presidential logo is a stylized American flag — as it turns out, one that looks remarkably similar to the logo for America's Best Contacts & Eyeglasses.

The company's CEO, Reade Fahs, said he doesn't mind but also that it's unlikely the governor hasn't seen the 18-year-old logo. "It's on hundreds of stores across the country. So assuming he's got good vision, he probably would have spotted it in his campaign travels. And we have lots of stores in Wisconsin too."

When writer Ta-Nehisi Coates sat down at NPR's New York studios a few days ago, he got a little emotional.

It was the first time that Coates, who writes for The Atlantic, had held a copy of his latest book, Between the World and Me.

This book is personal, written as a letter to his teenage son Samori. In it, we see glimpses of the hard West Baltimore streets where Coates grew up, his curiosity at work on the campus of Howard University and his early struggles as a journalist.

Daniel Majok Gai wants to go back to South Sudan.

He thinks he can help his homeland — the youngest nation in the world. Today marks the fourth anniversary of its independence. But there's little celebration. The country is being ripped apart by civil war.

Yet Gai, who suffered through years of violence and pain as a refugee, believes he can play a role in moving South Sudan toward peace and safety.

Against all odds, the 34-year-old is an incredible optimist.

He was 6 when a militia attacked his village.

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