Thank you, my only concern is for this new knowledge to be somewhat applicable. With Rails the upside was that I could do a ton of different small-medium-sized

Thank you, my only concern is for this new knowledge to be somewhat applicable. With Rails the upside was that I could do a ton of different small-medium-sized projects - there is always a place to spin up a quick Rails server to do some parsing / automate stuff. If I try to pick something really esoteric I may end up not using it as much. What would be the most area of application for Prolog? I looked up the Wiki of course, but curious to hear a bit more casual perspective.