What to Know About US Nuclear Weapons as Trump Threatens to Restart Testing

Though the country’s nuclear arsenal has undergone no explosive testing for decades, federal experts say it can reliably obliterate targets halfway around the globe.

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In a Looming Nuclear Arms Race, Aging Los Alamos Faces a Major Test

The lab where Oppenheimer developed the atomic bomb is the linchpin in the United States’ effort to modernize its nuclear weapons. Yet the site has contended with contamination incidents, work disruptions and old infrastructure.

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U.S. Says Decision to Turn Back French Scientist Had Nothing to Do With Trump

The Department of Homeland Security said the academic was denied entry because he had “confidential” data from an American lab, not because of his views on the president’s policies.

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