For centuries it was thought that the frontal part of the human brain handled vision (simply because it is near the eyes). Today we know that this part does not handle vision. The part that handles vision turned out to be at the rear of the brain. The front part of the brain is called the prefrontal vortex and is responsible for concocting lies: Pathological liars have more prefrontal white matter.
Females have XX chromosomes, that is, they can only give one X chromosome. But since males have XY chromosomes then men can either give the X or the Y chromosome. This means that it is actually the males who determine the sex of the baby (by giving either the X or the Y chromosome).