Two Duolingo scientists (Masato Hagiwara and Burr Settles) posted an article on TechCrunch with insights about how to learn a language successfully, based on Duolingo data.    

Whether you want to become a successful freelance writer, CEO of a major tech company, or a language learning guru, there is a lot you can learn from other successful people. […]

No matter who you are, where you come or what have been your experiences, the reality is that there are certain key elements that will either make your learning proceed […]