It's not 100% maternal. More like 65-75%.
And supposedly what is most impacted is the type of thinking you do, not how much. That is, your horsepower may be 50/50 between your parents, but whether you're artistic, analytical, mechanical, mathematical, spacial/kinesthetic, etc, is more dependent on your mother than your father.
I believe it just because my brilliant father can't fix his own kitchen sink but my scatterbrained mother can take a car engine apart and put it back together in better working order than it started in.
My father's a sponge for history, language, art, etc, but can't do mechanical/analytical stuff. My mother's dumb at everything, but mysteriously good at fixing things, building things, and logic puzzles.
I'm shit at everything my father's good at, but have a 4.0 in my engineering degree so far, 4 years in.
I believe most women just pretend to be stupid. Because they're coddled by society. If they play dumb, people do things for them. They're expected to be dumb, so most even believe that they're dumb. I know a lot of girls that washed out of, say, Calc 2 or Statics, were entirely capable of handling the class if they were just willing to tolerate a bit more study time.
But most chose to spend their spring breaks partying or binge watching Netflix while a lot of us guys used the week to study for 12 hours a day. We had a few girls show up off and on for our marathon study sessions, but not one came to all 5 days, and not one stayed for a whole day at a time.
We got caught up on everything from the first 8 weeks, and got big head starts on the seconds 8 weeks. A month into the second half of the term we're sailing through the third round of exams and the girls are pulling all-nighters and crying in the halls over how they're gonna have to withdraw because a D isn't high enough to receive degree credit. Meanwhile, some guys with Bs are losing their shit because they lost their 4.0s.
