There are many ways that our brain "economizes" on thinking. For example, all of us know what a chair is. When we walk into a room with chairs we have never seen, we recognize that these are places where we can sit. No one has to introduce us to our school"s furniture and say, "Hey, this is a chair!" It may seem like a small thing, but it means that we can make decisions more effectively. But sometimes, like the chair...