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The world's top influenza researchers agreed to a voluntary moratorium on working with contagious, lab-altered forms of a particularly worrisome form of bird flu back in January. The hold was supposed to last just 60 days. It's now been more than six months, and scientists don't agree on what should happen next.

Top universities are embracing free online education. Dozens of schools, such as the University of Pennsylvania, are now offering classes to thousands of people across the world. But what will this mean for the future of the classroom, and the brand of the universities involved?

Many Americans have long believed that the United States is a land of opportunity, where anyone who works hard can climb the economic ladder. But evidence from recent decades indicates that, for many Americans, that dream of economic mobility falls short.

The magazine hasn't hit newsstands, but some say it glorifies alleged Boston bomber Dzhokhar Tsarnaev. Rolling Stone's editor stands by the use of the photo to help tell the story of "an incredibly normal kid" who turned into "a monster."

Since June, documents leaked by National Security Agency contractor Edward Snowden have produced revelation upon revelation about the nation's top-secret intelligence gathering operations. The latest information, about U.S. spying on foreign leaders, has angered even some dependable U.S. allies. New York Times national security reporter Scott Shane, and Sen. Ron Wyden, D-Ore., a senior member of the Senate Intelligence Committee, discuss the latest Snowden-related leaks.

Sen. Rand Paul of Kentucky, a top 2016 GOP presidential prospect, is stirring curiosity among black leaders for his outreach efforts and activism in reforming mandatory sentencing laws.

In 2006, Oregon successfully made pseudoephedrine, a key ingredient of meth, a prescription drug. Since then, Mother Jones' Jonah Engle reports, 24 states have tried to follow suit — and 23 have failed. Engle attributes those failures to pharmaceutical companies' massive lobbying efforts.

Political unrest in Egypt might seem low on the list of concerns for the U.S. government. But one commentator says the situation there needs to be dealt with swiftly. Guest host Celeste Headlee speaks with Shadi Hamid, of the Brookings Doha Center, about the risks of forgetting Egypt.

Carnival in Rio attracts tourists from all over the world. But there is a murky — and sometimes deadly — underbelly to the celebrations. The recent murder of a samba school official highlights the links between the glittering affair that is Carnival and the city's criminal world.

Last week, thousands of Haitians gathered in a stadium for the final round in a national songwriting contest. The topic: restavek, the term for the thousands of children who are modern-day slaves.