The human brain is remarkable in its ability to imagine—to create worlds and situations outside of its reality. We can imagine complex possible futures, fantasy worlds, a better golf swing, and jars of peanut butter. Our imaginings can make us relaxed or anxious, while the most impressive feat of human imagination may be our ability to use it in creative endeavors. As he surveys the range of this super-power, Jim Davies also considers how our imaginations might be used to make things better for ourselves, and for the world.