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The Syrian opposition is in disarray, the AP reports.

The head of the Syria's main opposition group, the Syrian National Council, said he would resign and some members of the group threatened to leave it "amid rampant infighting."

The AP reports:

President Obama has said "I don't bluff," when it comes to opposing any effort by Iran to develop nuclear weapons (which that nation says it is not trying to do). And, he told The Atlantic's Jeffrey Goldberg in March, "all options are on the table."

Ever wonder why some people can run a 50-mile ultramarathon while for others even the thought of such endurance sports borders on torture?

Exceptional physical fitness, of course, sets the ultramarathoners apart from the rest of us. But scientists say what might be more important is athletes' excellent ability — both psychologically and physically — to cope with pain.

It turns out that most athletes' high tolerance for pain while exercising may also help them deal with it when they're at rest.

Facebook hopes to raise more than $100 billion in its initial public stock offering. In a piece at Slate.com, tech columnist Farhad Manjoo warns that Facebook users can expect to see changes, including lots more ads. But he warns the company must balance profit seeking with the desires of users.

Transcript

NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. New elections are now set for June 17 after a failure to form a government in Athens earlier this week, but some worry that Greece might be out of the eurozone before votes can be cast. While the great majority of Greeks say they want to keep the euro, opinions polls also show anti-austerity sentiment rising.

Truvada is a pill that's already used to treat people with HIV. A daily dose can also significantly reduce the risk of new infection. And a panel recommended the FDA approve an over-the-counter HIV test, OraQuick. Users could test and interpret their results at home in as little as 20 minutes.

The Census Bureau announced that for the first time non-whites now make up the majority of births in the U.S. The demographic shift raises questions about how this trend will affect policy in the country, particularly with regard to education and social programs.

Donna Summer, who sang some of the most memorable anthems of the disco era from "Love to Love You Baby" to "Bad Girls," has died after a long battle with cancer. She had a top 40 hit every year from 1976 to 1984, including the song she once told NPR she'd perform till the very end, "Last Dance."

Facebook co-founder Eduardo Saverin, who renounced his U.S. citizenship, is now facing backlash from politicians: Two U.S. senators are proposing a plan that would prevent people like Saverin from reentering the country.

As we reported yesterday, by some estimates Saverin may save $67 million in taxes by giving up his citizenship.