Most intelligent persons of the world

[MrBehemoth]

That all depends on what one means with learning a language. Do you know a language when you know all the words and how to use them? Or do you know a language when you know how to use it in its basic form? If one follows the first question, that means I do not know my mother tongue because I do not know all Swedish words.

Fair point, but I don't think it's possible to learn how to use a language in it's basic form in one day either. For example, I could learn to say, "Var är tågstationen ?" or "Vänligen kan jag köpa en biljett ?" but it would take months for us (or you and Sidis) to have a conversation on a topic of your choosing.