Every once and a great while I stumble on a Linux distro that makes me sit up and smile. Modicia O.S. is one of them. It is not that Modicia steps over the bleeding edge of innovation. It is a seemingly standard desktop Linux distribution based on Xubuntu. It comes in one desktop flavor, Xfce -- but with a twist. Yet nothing is standard about Modicia O.S. That is what generates the happiness.