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

FORBES: Paul Ryanomics