We have a rule in our house - "You must ask before you take something." Seems pretty simple. "Can I look at the book you have?" - "Would you mind passing the salad dressing when you are done?" - "Can I play a game on the iPhone when you are finished?" These are simple requests but very hard to implement. Why do we all struggle with crossing into each others space, taking and using what is not ours? Why does it seem easier to grab something from someone, knowing the likely tantrum or protest that will follow? And as adults I don't think we can limit this behavior to our preschoolers. I have seen many spouses take something directly from their beloved with intentions to "explain it" or "fix it." Our struggles with entering into the world of others is connected to a developmental skill. It's called, Theory of Mind. Developmental experts have used the idea of Theory of Mind to explain a person's ability to identify bel...