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rocket scientist [countable]
1 used humorously to emphasize that something is easy to do or understand : 
It doesn't take a rocket scientist to work out that doubling productivity will improve profits.
it doesn't take a rocket scientist (to do something)
informal
It doesn't take a rocket scientist to work out that doubling productivity will improve profits.2 someone who is extremely clever
3 a scientist whose work is related to rockets
