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A common vitamin supplement appears to dramatically reduce a woman's risk of having a child with autism.

A study of more than 85,000 women in Norway found that those who started taking folic acid before getting pregnant were about 40 percent less likely to have a child who developed the disorder, researchers reported in the Journal of the American Medical Association.

Sometimes the best way to advance an argument is by looking back.

President Obama's second inaugural address was filled with historical allusions. His State of the Union address on Tuesday, which will lay out a long list of agenda items for the year and his second term, is likely to employ fewer references to the past.

North Korea's latest nuclear weapons test is much more powerful than the previous two, according to estimates made by instruments that measure seismic waves from the blast. It's about the size of the bomb that devastated Hiroshima in World War II.

But it's not so easy to verify the claim that the nuclear explosive has also been miniaturized. That's a critical claim because a small warhead would be essential if the rogue regime chose to threaten the United States with a nuclear-tipped missile.

Big bombs are easier to make, but they aren't all that useful as a threat.

Plenty of people are ready to offer advice on noshing options when it comes to the Super Bowl. But what do you serve when the occasion for gathering in front of our screens is President Obama's State of the Union address?

When NPR White House correspondent Ari Shapiro posed that question to his 125,000 Facebook followers earlier Tuesday, plenty of people jumped at the chance to toss off a bon mot.* Among our favorites: