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Tripling a penalty that was announced this spring, Penn State has shut down the school's Kappa Delta Rho fraternity chapter for three years, after an inquiry over a Facebook group page that collected pictures of nude women also uncovered other transgressions.

Sometimes a story takes odd turns as you report it. Every once in while it goes off the rails. That's what happened as I reported on a new study purporting to explain how a childhood vaccine helps prevent leukemia. The experience reaffirmed the lessons I've learned in my years of reporting on vaccines and other scientific research: Be wary of grand claims, get outside perspectives on new research and never, ever rely only on the press release.

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DAVID GREENE, HOST:

It's one of the biggest challenges in higher education today: What do you do with the nearly one in five working-age adults who have some college experience, but no degree?

Sokeo Ros was one of them. "I just hated" community college, he says. "I wasn't being challenged."

Ros, 34, was born in a Cambodian refugee camp in Thailand. He dropped out of two colleges, switching majors several times.

Updated to reflect that Santorum is now officially in the race.

Former Pennsylvania Sen. Rick Santorum is praying for political lightning to strike twice.

Even after pulling an upset win in the Iowa caucuses four years ago and going on to survive the longest against eventual nominee Mitt Romney, the GOP presidential hopeful is again the underdog in a much more crowded 2016 field.

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