They're from Mars, in a metaphor (3)
I believe the answer is:
men
(Other definitions for men that I've seen before include "Human males" , "Adult males" , "Soldiers" , "'So many ..., so many opinions'" , "Males of Armenian extraction." .)
I believe the answer is:
men
(Other definitions for men that I've seen before include "Human males" , "Adult males" , "Soldiers" , "'So many ..., so many opinions'" , "Males of Armenian extraction." .)