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The federal government has signed off on a long-delayed study looking at marijuana as a treatment for veterans with post-traumatic stress disorder, a development that drug researchers are hailing as a major shift in U.S. policy.
PHOTOS: St. Patrick's Day Snow Slams DC, Philly, Baltimore
March Temperature Extremes Not a Factor in Spread of Common Cold
Saint Patrick's Day Weather Always a Gamble for Bagpipers and Irish Step Dancers
Despite mild weather for the opening ceremony, winter may take its toll on the nation's cherry blossom trees, postponing their peak bloom season.
Although most Americans believe global warming's effects will take hold during their lifetime, they don't expect these changes to pose a serious threat to their way of life, according to a new poll.