Review.
Why men don't listen & women can't read maps
Book by Barbara and Allan Pease.

Accordingly, man became strong and tall while women less tall and strong. Development of brain in the same way. Women always kept the caves (house) fire burning and nurtured their children, and their brains developed to cope with their function and duties.Since 1980 there has been a significant interest in the research of differences of male and female. With the development and involvement of brain scanning equipment, there has been tremendous improvement in this research. Similarly, girls and boys are treated differently by their parents. Most girls were given dolls, while boys were given soldiers, footballs and cars. Girls were petted and boys were told not to cry, and not to show emotions. More than that, the biological evidences available now show that hormones and brains are responsible for this behavior. If suppose a boy and a girl have been brought up in an island, still boys will be boys and girls will be girls, same characters will prevail.