The world is full of gaps, missing opportunities, unfinished projects, and unfulfilled potential. We walk around every day complaining about the problems we see in the world. We don't like the height of a shelf, the color of a wall, the shape of a doorknob, the line at the DMV, the length of the traffic light, the taste of our morning coffee, the feed our our social media, on, and on, and on. Much of the world is set in stone, or at least feels like it, so 9 out of 10 cases the solution is to...