If you are learning Spanish try to watch them without subtitles, or just with the Spanish subtitles enabled. Luis is from Guatemala and speaks a very clear and easy to understand Spanish.
Luis and I got in touch and I invited him to sit down with me over Skype and talk about the new language learning system that had a lot of buzz about it over the summer, and that he introduced to us in a TED talk (in English and in Spanish). You can also read a detailed review of the system in a blog post here.
Sorry my side of the video isn’t included – I had a few technical problems during the call. All my audio is there and all of Luis’ side of the video too.
I hope you enjoy it, and if you were curious about DuoLingo I hope Luis’ answers clear up a few questions! Let me know your thoughts in the comments!