Holy cow, I wrote a book!
An idiom that entered the English language
(or at least the U.S. dialect of it) in the latter half of the
is "it's not rocket science",
meaning that something is not hard.
what do rocket scientists say when they want to say that something isn't hard?
I actually ask this question of a mechanical engineer who works
Sea Launch project.
"Heck, most rocket science isn't rocket science."