Several sheriffs in Colorado are digging in their heels against a gun law allowing temporary confiscation of firearms -- if a gun owner shows dangerous or threatening behavior. Scott Pelley reports. China and other countries -- minus the United States -- are racing to be the first to mine trillions of dollars worth of metals used in cell phones, supercomputers and more. Bill Whitaker has the story. And "Sesame Street" launches a new program for Syrian refugee children. Lesley Stahl has the story on this week's "6o Minutes." 

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