on january 24,1961 a boeing b-52 stratofortress carrying two 3.8-megaton mark 39 nuclear bombs broke up in mid-air, dropping its nuclear payload in the process, 9,000 ft down to the ground below in north carolina
information declassified since 2013 has showed that one of the bombs was judged by nuclear weapons engineers at the time to have been only one safety switch away from detonation, and that it was "credible" to imagine conditions under which it could have detonated
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