The federal rules for coverage of birth control by religiously affiliated groups are becoming clear. iStockphoto.com hide caption

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The cause of strokes in younger people remains largely a mystery. iStockphoto.com hide caption

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Eating refined carbohydrates like bagels may stimulate brain regions involved in reward and cravings, research suggests. iStockphoto.com hide caption

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A billboard advertising robotic surgery hangs outside Boston's Fenway Park in 2009. Hospitals and doctors have heavily promoted robotic surgery. Charles Krupa/AP hide caption

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