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'.
(..) - But I crashed it. It's a simulator, that's what it's designed for. Every time. I crashed it every time. You point the damn thing at Earth. It's not rocket science. And by this time tomorrow, you're gonna be back in Lake Zurich with a hell of a story to tell. You copy? (..)2013 Gravity