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.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

It's one of the biggest challenges in higher education today: What to 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.

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.

After taking the silver medal in the 2012 GOP presidential primary, former Pennsylvania Sen. Rick Santorum is making a second bid for the White House. Expected to launch his campaign near his boyhood home in Butler County, Pa., Wednesday evening, Santorum faces a very different — and much larger — field than four years ago.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

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