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I've always thought this was in reference to the envelopes of air that build around/in front of a jet coming close to the speed of sound, and science was pushing that envelope to its limit in an attempt to break through it. Since the breaking of the sound barrier was a big deal at the time it...

I always felt that "coming back like a bad penny" was less sinister than trying to pawn off a counterfeit, but rather dealt with the idea of getting stuck with a penny that was no good (like a Canadian penny). You slip it into your spending to get rid of it, but low and behold it shows up in...