Duolingo is a free language-learning app which allows users to use research-based methods in order to teach reading, writing, and speaking skills and listening. The popular app has well over 84 ...

Perhaps surprisingly, English only features twice on the list of the most popular second languages spoken in the world's largest countries. The world has a population of around eight billion people.

Large majorities in the 21 countries where we fielded this question say being able to speak their country’s most common language is important to national identity. And majorities in more than ...