North Korean leader Kim Jong Un is considering testing "an unprecedented scale hydrogen bomb" over the Pacific Ocean, says the country's foreign minister. It would be the first atmospheric test since ...

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"We've halted many years ago, but with others doing testing I think it's appropriate to do so," the president told reporters aboard Air Force One. Experts say that the resumption of testing would be a ...

Over the course of three days in early April, the University of Wyoming Department of Atmospheric Science took advantage of ...