Luis von Ahn
Dear Luis: You've been on my mind... We've never met in life or online, but I use your app every day. Thanks for creating Duolingo. I've learned a dozen languages throughout my life because I've traveled a lot, but I've forgotten many of these languages because I haven't used them. What you have created allows me to revisit any language I want, any day, from home. Thank you for your time and effort. Thank you for allowing users to learn languages for free. I am so grateful for you and for Duolingo. Gratefully... Noosha Ravaghi