Something is not difficult to understand or do; it's relatively simple or straightforward. Used to suggest that a task shouldn't be overly complicated.
This phrase emerged in the 1950s during the space race, when rocket science represented the pinnacle of technical complexity. It became popular as a way to contrast everyday problems with genuinely difficult scientific challenges.
The irony is that rocket science, while complex, follows well-understood physical principles - it's actually rocket engineering that's the real challenge. This phrase captures our cultural awe of space exploration while simultaneously using it to deflate pretension about simpler matters.
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