Have you ever thought about how your body works? Every day you make your body do lots of different action,such as when you walk,talk, or dance. But at the same time, your body automatically does many other thinks that are essential for everyday life. For instance, when you blink or yawn or breathe, you don't have to think about what you are doing; your body simply carries out these tasks for you. You might think this is strange, but the latest houses are like this, too.