He said after the mushroom cloud had exploded, those on the islands were told to dust themselves down and return to work.

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When I was studying engineering, I wired a circuit board incorrectly, and a small mushroom cloud of smoke rose from one of the components.

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The mushroom cloud alone was stretched out 41 miles high and was over 59 miles wide, essentially one big cloud from Hyannis to Boston, Massachusetts, or surely enough to cover Manhattan two times over.

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He signed the letter to Franklin Roosevelt warning that it may be possible to build an atom bomb, and the letters of his famed equation relating energy to mass hover in our minds when we picture the resulting mushroom cloud.

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We wouldn't want to be -- the phrase was that we wouldn't want the warning of an attack to be a mushroom cloud, so the argument was we had to attack because the threat was real, but it turned out the threat wasn't real.

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While the massive explosion that produced a mushroom cloud there last week is said not to have been caused by a "nuclear event, " press reports suggest the next one might be if, as some believe, Pyongyang is preparing to conduct a test of an atomic weapon.

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