More on girls and boys in this Fast Company article.
“In tests, on average boys show more interest in games like Lego, and girls are more interested in dolls, acting out social stories where they inject emotions and thoughts into the plastic figures. Lego is just one example of systemizing; this is the drive to build or analyse a system, which is simply anything that follows rules or patterns. So you are looking for consistent repeating patterns, and boys on average seem to show a stronger interest in systems, whereas girls develop social skills more quickly. I talk about this in terms of empathy, which is the drive to identify (and respond to) someone else’s thoughts and feelings. The systemizing/empathizing theory is a new model for characterizing typical sex differences.”