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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Dick Garwin Fought Nuclear Armageddon. He Hid a 50-Year Secret.

Richard Garwin’s role in designing the hydrogen bomb was obscured from the public, even his family, as he advised presidents and devoted his life to undoing the danger he created.

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