Calling all Trekkies! For those that have always wanted to learn Klingon but never found the time, The C.A.L.L application Duolingo is coming to the rescue. The app spokesperson is continuing to embrace all forms of languages, even for us conlangers. The Klingon lessons are set to be released early on in the new year. Duolingo already has an Esperanto learning system for those that are interested!