Have you ever thought about how your body works? Every day you make your body do lots of differrent actions, such as when walk,talk or dance. But at the same time, your body automatically does many other things 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.