They just try to crack lost languages and then translate it and find words that are not in english and look for it in the earth, that's why they rare languages are 'legends' till proven. U can't prove it if you don't understand it. It's hard to understand it with other languages as everyone had similar words, the words that were not similar become poetry untill proven on earth. Arabic was special cause of that but then it spread and it now it just becomes songs, but languages that are cracked and u find the meaning of the word become earthly proof and they crown it gold. Ancient egypt obviously the one they all wanted but its spread about in all the languages in africa, hiddein in words that only locals understand