Krio if you have ever tried to teach yourself esperanto!
If you have clicked on the Google logo today, you know that it is L. L. Zamenhof's birthday. When I was in my 20s I did the whole Esperanto correspondence course. It was fun! I was lead down that odd path by Harry Harrison's Stainless Steel Rat novels. I guess the late 19th century dream was that if all humans spoke the same language, then misunderstandings between nations/cultures/peoples would be fewer. But the tower of babel fell way back then, and now we are all forlorn. C'est la vie.