In some respects teaching never ends. Think about it. Most of us are tired and excited about the end of the year. But if you are like me a few weeks after the room has been packed up, you are eager to start thinking about next year. When you get to that point you might want to think about doing a simulation for both world wars and the Cold War. Teacher David Harms has developed these three simulations which you might want to consider for your classroom (and he has a pretty cool webpage as well).