Gender differences - are they real?

Picture this. Two boys, a 2 year old and a 6 year old, the 6 year old dressed in full camo attire, both with their pop-guns on their shoulders, hiding behind the bushes of the neighbors' mailbox. "Ready, set, aim" one shouts, and they jump from behind the bush to "ambush" a lady pulling out from the neighbors' house across the street. Now picture their sweet 3 year old sister, dressed in a pink shirt, pink pants, and pink sparkly shoes pushing her baby doll stroller with 3 purses, and toting another baby doll in a car seat. You try to tell me God didn't make boys and girls distinctively different! Don't worry - we are working on the whole "Don't point your pop guns at strangers" etiquette.