Esperanto - an effort by a Pole ...

I did. But, I am not sure if you understood what Esperanto meant. It was similar to that joke that here brought English and German together, that's not bad. Esperanto was aiming to do a similar thing seriously rather than the joke to bring Slavs, Germans, Yiddish/Jews, etc. Anyway, Zamenhof lived beyond his time and paid the cost by losing his children.

lmao

So he was in the RAF as well, very talented man.