Is it true that Duolingo is releasing a line of language learning books?? A friend of mine said they were- that would be so useful and cool especially if they are more in depth about teaching! O.O
That's hearsay at best if your friend is the source of that information. Point us to some authoritative source and we'll take it from there.
are you saying my friend is untrustworthy??? kidding, a book would be cool though!