The combination of horizontal drilling and hydraulic fracturing in shale rock formations is opening up previously unrecoverable oil, just as those technologies did for natural gas. It's driving a boom in U.S. energy production and creating bright spots in a tough economy across America.

Correspondent Patty Kim visits Williston, North Dakota, the site of America's largest shale oil field and heart of the new oil rush, to check out life in an oil boom town.

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