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The sand is pumped underground along with water and other chemicals to extract oil and natural gas trapped deep in rock. But researchers found that air samples taken at some drilling sites contained high enough levels of very fine silica particles to be dangerous to workers.

A look back at landmark cases makes clear that the Supreme Court never really knows exactly how its decisions will play out — especially not in the long run. That uncertainty must loom over the justices now as they contemplate the issue of gay marriage.

In a TV interview, Francois Hollande said companies that pay workers more than 1 million euros will see the tax on those salaries increase to 75 percent. The announcement comes as the Socialist leader battles plummeting approval ratings.

Financial terms of the sale, which is expected to close in the second quarter of 2013, were not disclosed. The announcement comes just weeks after major publishers launched their own book-recommendation website.

H&R Block claims it's equipped to guide you through the Affordable Care Act and the law's implications for your taxes this year. But the law doesn't really affect 2012 returns.

Researchers are using cellular machinery to turn E. coli bacteria into little computers. By creating on/off switches that are similar to electronic transistors, scientists can control each microbe's behavior.

Nearly 7 million people visit the Chateau at Versailles a year. But one day a week, it's closed. That's a spa day of sorts, when conservation work and cleaning takes place at the Grande Dame of France royal residences. The hardwood floors alone require nearly 1,000 gallons of wax a year.

Syracuse bounces Indiana. Marquette eliminates Miami. And NPR's David Greene promises (or threatens?) to sing on Morning Edition if Florida Gulf Coast wins Friday night. March Madness continues.

Foreign Minister Sergei Lavrov's remarks follow a week of tense rhetoric and tit-for-tat military moves between the two sides.

NPR executives announced Friday that they will stop production of Talk of the Nation this summer. The call-in program will be replaced with Here and Now, a newsmagazine that will be a co-production of Boston member station WBUR and NPR.