- (countable) a colloquial term for an astronautical engineer
- (countable, idiomatic) Someone qualified to understand or handle that which is overly complex, detailed or confusing; a genius.
- You don't have to be a rocket scientist to see that that idea won't work.
- This phrase is usually used in a negative comparison, as in the example above, to show that something is (or should be) simple, straightforward, or obvious.
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