Game of Thrones fans have yet another reason to rejoice: Duolingo will soon start a course in High Valyrian! While everyone knows what Valar morghulis means ('all men must die'), there's so much more to learn.
The language was fine tuned by specialist David J Peterson for the HBO show, and he contributed his knowledge of the language to build the Duolingo course as well, says this article in Mashable . Click to read more.