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Feb 19, 2017 at 19:56 history edited Ben C CC BY-SA 3.0
Provide examples not using the negative
Feb 19, 2017 at 9:11 comment added Mari-Lou A No, it does't have to be used in the negative, but de facto that is how it is used. A person who discusses a relatively easy task will say: ‘This isn't rocket science; if something's wrong, make it right.. If the project was difficult and complicated will they: "That is rocket science"? Naa... It simply doesn't fit in the OP's sample sentence.
Feb 17, 2017 at 19:23 comment added Phil Miller There's also the slightly malaprop combination of the two expressions, rocket surgery
Feb 17, 2017 at 9:01 history answered Ben C CC BY-SA 3.0