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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.

Mouaz al-Khatib said last Sunday he was reigning the presidency of the Syrian National Coalition. He criticized the international community for not doing enough to end the civil war in Syria.

NPR's Legal Affairs Correspondent Nina Totenberg ties up a few loose ends from a momentous week in the Supreme Court.

A government study of the medical records of 1,000 kids found no correlation between the number of vaccines a child received and his or her risk of autism spectrum disorder.

Instead, say it's from the "Outer Coastal Plain." (It's part of a plan to kick the state's reputation for making cheap wine.)

New restrictions on big depositors are controversial, and there's no consensus on the efficacy of the country's strategy. Besides affecting Cyprus' economy, the new measures could become a template for other eurozone countries. Selective restrictions might create a tiered system within the bloc.

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.

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.

The social website Goodreads, where readers share reviews and book picks, got picked up by online retail giant Amazon on Thursday. The price hasn't been disclosed. Goodreads has about 16 million members.