Why women are smarter!?

Its one theory. A typical male brain volume is nearly 1250 cc . And a female brain is around 1120 cc but men never used their brains to the peak! In our evolutionary stages, males were ought to do more physical tasks, so their brains never developed to the peak it deserved but women, as they were involved in less of heavy tasks, they were more involved in planning and strategising. So women are smarter from the very initial ages and they have retained this charm till day. Contradictions and other theories are welcomed too if someone thinks men are smarter!