- (countable, colloquial) astronautical engineer
- (countable, hyperbolic) someone qualified to understand or handle that which is overly complex, detailed or confusing; 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.
capable of understanding complex things