You don't have to be a 'rocket scientist' [=you don't have to be unusually smart] to understand the instructions.
Sales 'rocketed' from 1,000 units last week to 5,000 units this week.
The job is challenging, but it's not exactly 'rocket science'.
(..) We had a bit of a fight this morning. No, we didn't. Good price. Two. Two, sir. Good price. The rocket. Russian rocket. Come on, Oz, pick up the phone. We are weighing a serious move on the Syrian market. (..)2016 13 Hours