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The parents and the society have different expectation on the children of different genders. Therefore from the time they attend the kindergarten, the parents and teachers will give toys designed for different genders to the kids according to their gender. If a boy wants to play with a doll, they will be warned for doing that, and they are then taught to be cognitive of their gender and be brave by not showing their weakness. And if a girl wants to play with a gun, they will also be warned and taught to behave like a girl and try to learn how to possess the characteristics of a female.
Time after time, boys are trained to be stronger and stronger through the games and toys they play with, while girls are restricted to act tough so they become weaker and weaker. From this example do you think that the characteristics of male stronger than female are in born ? Or they are programmed to behave according to their gender by the way they are brought up with ?