rocket scientist

Definition from Wiktionary, a free dictionary

[edit] English

[edit] Noun

rocket scientist (plural rocket scientists)

1. (countable) One specializing in the science or study of rockets and their design.
2. (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.

[edit] Usage notes

• 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.