Rocket science is an informal term meaning very difficult, where the difficulty is in skill rather than stamina. This It is more oftenusually used in the negative, "this isn't rocket science", but doesn't have to be. as in the following examples:
- "Where we’re at with our telephone service, in some ways this is rocket science; nobody has done this stuff before" (Cable TV company Technical Director quoted in industry news article)
- "Design Is Rocket Science" (Title of blog post)
(There is also a similar term brain surgery.)