The fireball of the "Seminole" blast begins to show the shape of a mushroom cloud on June 6, 1956.CORBIS/Corbis via Getty Images Over a period of more than a decade, the US military conducted dozens ...

U.N. Secretary-General António Guterres raised concerns Thursday that a concrete dome built last century to contain waste from atomic-bomb tests is leaking radioactive material into the Pacific.

As far as Ernest Davis II knows, he’s the only living Delaware veteran of the Enewetak Atoll atomic debris cleanup mission. The Dover resident was barely out of his teens when he, along with about ...

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