What does it mean when someone says, "It doesn't take rocket science" ?

Question

What does it mean when someone says, "It doesn't take rocket science" ?

Answer 1

well what they mean is that whatever you may be doing is not hard or difficult.

Answer 2

it means the thing your doing is easy and not as hard as scientist.

Answer 3

it means the subject is not too difficult to understand!!

Answer 4

It's EASY..