Russian ⇄ English

и ежу понятно stresses
gen.	it doesn't take a rocket scientist to (understand, etc.; KudoZ)
slang	does the bear shit in the woods? (yashenka)
и ежу понятный
gen.	crystal clear (Ivan Pisarev); obvious (Ivan Pisarev); with no questions asked (Ivan Pisarev); without any doubt (Ivan Pisarev); beyond any doubt (Ivan Pisarev); raising no doubts (Ivan Pisarev); undoubted (Ivan Pisarev); unquestionable (Ivan Pisarev); pretty straightforward (Ivan Pisarev); non-challenging (Ivan Pisarev); uncontroversial (Ivan Pisarev); be beyond any question (Ivan Pisarev); undisputed (Ivan Pisarev); non-controversial (Ivan Pisarev); incontrovertible (Ivan Pisarev); indisputable (Ivan Pisarev); incontestable (Ivan Pisarev)

и ежу понятно: 4 phrases in 2 subjects

General	2
Idiomatic	2