Mining has been the lifeblood of this remote Congolese hill town for decades. Now, it is fueling the spread of a devastating virus. By Declan Walsh and Arlette Bashizi The U.S.-brokered agreement ...

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As Xi Jinping visits Pyongyang, he faces an emboldened North Korean dictator, whose alliance with Russia has reduced his dependence on China. By David Pierson and Choe Sang-Hun Scientists and U.S.